Have Your Heart in Your Mouth.

This expression means that you're really afraid or anxious about something. When your heart starts beating so much that you can feel a thumping(怦怦跳) in your throat, it may feel like you "have your heart in your mouth."
Have Butterflies in the Stomach
How did butterflies get in your stomach? Well, those really aren't butterflies in there. It is a way of describing those nervous feelings you might get before a test or a very important decision.These stomach flutters (跳动) are normal and happen to many people. Some people believe having a few butterflies might even help you perform better.
Sick as a Dog
If you've ever been very sick, you may have used this expression. Because dogs eat just about anything they find, they often get sick. So it's all right to describe someone who's not feeling well as being "sick as a dog".
Under the Weather
When it's rainy all day outside, how would you feel? This expression comes from the idea that bad weather might hurt a person's health and mood(心情).

    People in Western countries are eating less meat these days, whether for their health or because they want to protect animals. But now they have another reason.

    Eating less meat can help to prevent climate change, according to a recent study published in Nature.

    Raising livestock (家畜) is bad for the environment. When animals like cows digest (消化) food, their stomachs make greenhouse gases, which are a major cause of global warming. Seventeen percent of greenhouse gas emissions (排放) come from livestock farming, The New York Times reported.

    In addition, to raise these livestock, people have to cut down forests and turn them into farms. Forests play a key role in fighting global warming because they absorb greenhouse gases.

    Eating less meat according to certain guidelines could cut global food-related emissions by nearly a third by 2050, the study found. Maintaining (保持) a vegetarian diet in the long term could bring down emissions by 63 percent.

    But eating less meat won't be easy. According to the study, people in Western countries will need to eat 90 percent less meat than they do now in order to have an impact (影响) on our climate. Scientists are now trying to find new foods to replace meat.

    Some say that insects (昆虫) could help. A 2013 UN report said that eating insects is healthier and better for the environment. They produce 75 percent less greenhouse gases than livestock.

    Some experts are creating lab-grown meat. They make meat in a lab using livestock cells (细胞). In March, US company JUST said people in the US might be able to buy its lab-grown meat by the end of this year.

    One day, Jack's parents told him that his grandpa would retire (退休) after working for forty years. Jack said1, "I'm only seven, so it means my grandpa has been…er…a really long time!"

    His parents said, "Yes. There is a (n)2place in his heart that we don't know how to fill. That's why we are going to have a surprise party for him."

    Jack loved his grandpa and wanted to do something3for him. He remembered the business card his grandpa had given him two years before. He knew that his grandpa would no longer hold the position on that card, so he decided to build a new one for his grandpa.

    When the big night came, Jack was4. He put his gift in a small box. But he didn't want to put his gift together with others'. He carried it around with him the whole5.

    When all the other people6, he took his grandpa's hand and brought him over to a chair and gave him the gift.

    His grandpa smiled, "Well, it must be a beautiful7. May I open it now?" "Sure!" Jack said excitedly.

    As Jack's grandpa opened the gift, tears came into his eyes. He was touched by Jack's gift. Jack gave him the greatest gift he had8got! It was a business card with his new position FULL-TIME GRANDPA! Jack said, "Now your9job is my grandpa."

    "Well10do l get paid?" his grandpa asked, smiling. "As many hugs (拥抱) as you want!" With these words, Jack gave his grandpa a hug. "Well, I guess that means I'm the richest man in the world!" said the grandpa.

    It's Friday today and we have an art class. But we don't have it at school. Where do we have it? Do you know? We have the class in the1It is our first time to have a class outside, so we are very2

    In the morning, our art teacher, Mrs. Wang3the classroom and says, "Boys and girls, today we'll have a class in the zoo. You can see your favorite animals and draw pictures of4there."

    Then we take a bus to the zoo. After we5there, we see so many animals. Some6eat bamboo (竹子). They are so cute. Tom7a picture of them. Jenny's favorite animals are monkeys (猴子). She wants to see them first.8those monkeys are in the trees. They don't come9, so Jenny can't see them. She doesn't know what to do. Peter is very10.He asks Jenny to give (给) these monkeys some bananas. Then all the monkeys come to them. All of us are happy to have the class in the zoo.