In Canada and the United States, people enjoy entertaining(请客) at home. They often invite friends over{#blank#}1{#/blank#} a meal, a party, or just for coffee and conversation.

    Here are the {#blank#}2{#/blank#} (kind) of things people say when they invite someone to their home: "Would you like to come over for dinner Saturday night?” "Hey, we{#blank#}3{#/blank#}(have) a party on Friday. Can you come?"

    {#blank#}4{#/blank#}(reply) to an invitation, either say thank you and accept, or say you're sorry and give an excuse: "Thanks, I'd love to. What time would you like me to come?" {#blank#}5{#/blank#}"Oh, sorry. I've tickets for a movie."

    Sometimes, {#blank#}6{#/blank#}, people use expressions that sound like invitations(邀请) but which are not real invitations. For example: "Please come over for a drink sometime." "Why not get together for a party sometime?" "Why don't you come over and see{#blank#}7{#/blank#}(we) sometime soon?"

    They are really just polite ways of {#blank#}8{#/blank#}(end) a conversation. They are not real invitations because they don't mention a specific(确定的) time or date. They just show that the person is trying to be{#blank#}9{#/blank#}(friend). To reply to expressions like these, people just say "Sure, that would be great!" or "OK. Yes, thanks."

    So next time when you hear what sounds like an invitation, listen {#blank#}10{#/blank#}(careful). Is it a real invitation or not?

    Are you a-teenager{#blank#}1{#/blank#} (absorb) in music? If so, I will give you a warning – the music you love could end up making you deaf. More {#blank#}2{#/blank#}(specific), the way you listen to the music you love could make you deaf.

    The problem is .headphones. In the past, we played music out into the air. Then earmuff-style（耳罩式）headphones {#blank#}3{#/blank#} (invent) and we were able to play music much closer to our eras. Now we have earbuds（耳塞）, which many doctors think are {#blank#}4{#/blank#} (bad) than older headphones because they play music directly into the eras. Also, earbuds are not as good as blocking outside noise, so people{#blank#}5{#/blank#} use them nay turn the volume {#blank#}6{#/blank#} to dangerous levels.

    What's the dangerous level? Well, it {#blank#}7{#/blank#}(depend) on how long you are going to listen to the noise. Very, very loud sounds can be dangerous to your hearing. But the scary {#blank#}8{#/blank#}(true) is that even seemingly “normal” noise can be dangerous {#blank#}9{#/blank#}you listen to it all the time.

    Think for a minute about how long you spend {#blank#}10{#/blank#} (listen) to loud noise with headphones every day. Then do some research. There are resources online telling you what volumes are safe, and for how long.

    Dogs are often called “man's best friend” and make ideal pets.

    {#blank#}1{#/blank#} most attractive quality of a dog is its faith in its owner. They always greet us when we come home and they will never leave us even {#blank#}2{#/blank#} a desperate (绝望的) situation. For example, there was a very sick man and his dog barked and barked until the rescue team {#blank#}3{#/blank#} (arrive).

    Furthermore, dogs are strong animals {#blank#}4{#/blank#} will protect us. Houses with dogs are considered much {#blank#}5{#/blank#} (safe) than those with burglar alarms (防盗警报器). Not only will they stop thieves, {#blank#}6{#/blank#} they will also guard against fire. For example, there was a serious fire and a dog managed {#blank#}7{#/blank#} (pull) its owner out.

    And {#blank#}8{#/blank#} (final), dogs can be trained by people. Dogs can do a number of things that people can not. For example, they can find drugs, bodies, illegal DVDs and hunt down prisoners with {#blank#}9{#/blank#} (they) nose. They're also used to help the elderly and disabled.

    To sum up, dogs are really friendly, civilized(文明的) and loyal {#blank#}10{#/blank#} (partner).

    Modern-day robots are programmed to handle tasks that are normally carried out by humans. They are faster and{#blank#}1{#/blank#}(accurate) than human workers and never ask for a pay rise or take breaks!

    Robots are also able to work{#blank#}2{#/blank#}dangerous situations.

    Researchers at the University of Arkansas in the United States say that the mobile robots which have been created already are ideal for the job of hospital attendants. These mobile robots store a{#blank#}3{#/blank#}(detail) map of the hospital in their memory. The robots' sensors can detect{#blank#}4{#/blank#}(object) and quickly get out of the way. Although these robots cannot go up and down know how{#blank#}5{#/blank#}(press) a button of an elevator.

    Researchers at a Massachusetts' university are creating the first robot {#blank#}6{#/blank#}can constantly change its shape according to the task it has to do. These are called polymorphic robots. "Polymorphic" means{#blank#}7{#/blank#}ability to take different forms. A 3D printer{#blank#}8{#/blank#}(place) inside the robot to create the desired shape. The entire process of changing forms in this manner is called the rapid printing technology which is{#blank#}9{#/blank#}(fair) common in the car industry to produce complex 3D structures quickly. Once the robot has performed{#blank#}10{#/blank#}(it) task, it can be melted down and recycled into another useful part by the 3D printer.

    We've all heard that breakfast is {#blank#}1{#/blank#} most important meal in the day. It may actually be true. Recently, a study of more than 50,000 adults aged 30 and older{#blank#}2{#/blank#}(find) that people who have breakfast are more likely to lose{#blank#}3{#/blank#}(weigh) than those who don't eat a morning meal. Other studies connect not eating breakfast{#blank#}4{#/blank#}a higher risk of high blood pressure, heart disease and so on.

    However, it's not just when you eat that matters, but{#blank#}5{#/blank#}you eat also matters. {#blank#}6{#/blank#}(keep)fit, you should have a balanced diet with protein, fiber and healthy fats, which is the key to a satisfying{#blank#}7{#/blank#}nutritious breakfast . If you want to keep{#blank#}8{#/blank#}(you) from being hungry later of the day, you'd better eat within 90 minutes after waking up. Also, coffee drunk on an empty stomach is not recommended because it can be{#blank#}9{#/blank#}(harm)to your body.

    There is an old saying that advises "Eat breakfast like a king, lunch like a prince, and dinner like a beggar. It is worth{#blank#}10{#/blank#}(follow).