Kids who use media in unhealthy ways may have problems {#blank#}1{#/blank#}relationships, conduct and other emotional symptoms, lead author of a US new study warned.

    A study of the University of Michigan (UM){#blank#}2{#/blank#} (release) recently on its website found that how children use the devices, rather than how much time they spend on them,{#blank#}3{#/blank#} (be) the strongest predictor of emotional or social problems connected with screen {#blank#}4{#/blank#}(addict ).

    The study revealed that {#blank#}5{#/blank#}matters most is whether screen use causes problems in other areas of life or has become{#blank#}6{#/blank#}all-consuming activity.

    Some of the warning {#blank#}7{#/blank#} (sign) include: if screen time interferes with daily activities, causes conflict for the child or in the family, or is the only activity {#blank#}8{#/blank#}brings the child joy. Though much research{#blank#}9{#/blank#} (exist) on adolescents and screen use, this is considered as the first tool to measure how addicted children are to screen media. It will be a{#blank#}10{#/blank#} (value) tool for parents, clinicians and researchers.

In 1990, over 100 countries signed {#blank#}1{#/blank#} international agreement to make it illegal to buy or sell ivory, which is mainly used for jewelry. Most ivory is made from the tusks(象牙) of African elephants. These tusks are {#blank#}2{#/blank#}(terrible) valuable—one pair is worth more than three times the income of an African farmer or a factory worker in a year.

    Hunting elephants was so profitable {#blank#}3{#/blank#}from 1979 to 1989 the number of elephants in Africa fell from 1.3 million to 600,000. It was feared that by the year 2020 there would be none {#blank#}4{#/blank#}(leave). However, thanks{#blank#}5{#/blank#} the international agreement, there {#blank#}6{#/blank#}(be) much less illegal hunting since 1990.

    But considering {#blank#}7{#/blank#}(vary) of aspects, it costs a lot of money to preserve elephants. Games wardens (看守人) must be hired to protect them. Land must be set aside for them, and when they destroy a farmer's crops, the farmer must {#blank#}8{#/blank#}(pay) compensation.(赔偿金)

    Zimbabwe and four other African countries say that some of the elephants should be killed legally. This would help keep the population stable, and selling the ivory would help pay for preserving the elephants. But conservationists say that {#blank#}9{#/blank#}(make) ivory legal to sell would lead to even more illegal hunting. Others say {#blank#}10{#/blank#}is wrong is to kill elephants because they are sensitive animals that feel emotional pain at the death of other elephants.

    I was visiting Australia a few weeks ago. I knew I couldn't leave the surf capital of the world {#blank#}1{#/blank#} having a try myself. I booked a group surf lesson when I was in Byron Bay, which is a really popular place for {#blank#}2{#/blank#} (skill) surfers to go and catch some waves!

    We started off with a warm-up by doing some stretches and going for a jog along {#blank#}3{#/blank#} beach. Then we all {#blank#}4{#/blank#} (lie) down on our surfboards on the sand and practiced {#blank#}5{#/blank#} (jump) up to the standing position. After this, we were ready to go out and try it out on the water. Well, surfing is much {#blank#}6{#/blank#} (hard) than it looks—when you watch people from the beach they make {#blank#}7{#/blank#} look so easy! I had tried a couple of times but failed before one of the {#blank#}8{#/blank#} (coach) came to help me and held my board steady.

    Finally I started to get the hang of it and by the end of the lesson I managed {#blank#}9{#/blank#} (stand) up on the board by myself, {#blank#}10{#/blank#} was a pretty awesome feeling. Now I can't wait to try it again, although I'll definitely need to wear a wetsuit if I'm surfing in the UK!

    Environment-friendly ideas have been created to supply people with helpful {#blank#}1{#/blank#}(tip) on how they can help the environment {#blank#}2{#/blank#} well as save money. I honestly believe that everyone wants to help the environment, even if they do or do not believe in global warming.

    With power bills, water bills and all other expenses{#blank#}3{#/blank#}(continue)to rise, it's very hard for the average worker. No matter what your {#blank#}4{#/blank#}(finance) position is , there is always something everyone can do {#blank#}5{#/blank#}(help) save our environment.

    We are not the only ones that live on this {#blank#}6{#/blank#}(amaze) planet. We also share it {#blank#}7{#/blank#}a wide range of strange and wonderful animals. It would be a great tragedy if they {#blank#}8{#/blank#} (be) not around for our future generations to enjoy. Every little bit helps, so please do all {#blank#}9{#/blank#} you can to protect our environment and the environment of these surprising animals.

    I hope these environment-friendly ideas can help everyone to do {#blank#}10{#/blank#}(they) bit for the environment and to make this world a better place.