1. 今天下午没课。让我们去公园吧！　
　We're free this afternoon. __________ go to the park.
2. 你每天最好多吃蔬菜和水果。
    __________ eat more fruit and vegetables every day.
3. 他们正在为运动会做准备。　　　
    They __________ the sports meet.
4. 讲英语时，不要怕犯错误。
     __________ mistakes when you speak English.
5. 学生们正忙着帮老人们打扫房间。
    The students __________ the house.

1. 六点他们不回家。
    They ______ ____   __        ______ at six o’clock.
2. 下课了，我们休息会儿。
    Class is over. Let’s ______ ______ ______ .
3. 星期天我们去公园。
    We ______ ______ the ______ ______ Sunday.
4. 我喜欢和朋友们在空闲时交谈。
    I like ______ ______ ______ my friends in the free time.
5. 下午三点半我们上英语课。
    We ______ ______ at ______ ______ ______ .

A: Hey, Ginny. What do you call those big, gray things in the water? 　　
B: 1______. 　　
A: What? 　　
B: Manatees. They're very gentle and very shy. 　　
A: 2______? 　　
B: They're usually about 10 feet long and they weigh about 1000 pounds. 　　
A: How much do they need everyday? 　　
B: They need about 1 00 pounds of aquatic food a day. 　　
A: 3______? 　　
B: It is underwater plants and vegetation (植被). 　　
A: That's what they eat? 　　
B: Yes. it is. 　　
A: 4______? 　　
B: Yes, they are endangered (陷入困境). But, we're trying to save them. 　　
A: Wait a moment. Why are they endangered? 　　
B: 5______. 　　
A: Where do they live? 　　
B: They live in the swamps (沼泽). 6______.They are endangered also because there sometimes
    isn't enough food for all of them. 　　
A: 7______. There used to be a lot of manatees, but now there aren't very many ofthem left, I think. 　　
B: Yes, 8______. At this point, there are only about 2,500 in the U.S. 　　
A: 9______? 　　
B: Since 1927 laws have been passed to protect them. 　
A: Thank you for your information. 　　
B: 10______.