4.不同的鲨鱼体型不一样。

　 Different sharks come _________ different __________.

3.我们不应该往海里乱扔杂物，应该把脏的海域清除干净。

　 We _______ _______ the seas, and should ________ _______ the dirty ________.

2.一小时内完成这工作是可能的。

　 　It’s ________ _________ __________ the work _________ an hour.

1.先输入海南岛，再按回车键。

　 　First ________ ________ Hainan Island, then _________ the ________ ________.

8. _______ your father ________ (watch) TV from 8 to 9 last night?

7. Ask Mary ________ (not talk) in class.

6. The students ___________ (learn) 500 English words since they ________ (begin) to learn English.

5. _____ ___ (not listen) to the radio while you _____ ___ (do) your homework.

4. -Where’s your father?

　　 -He ___________ (go) to Beijing. He _______(leave) this morning.

3. The teacher told us the earth _________ (go) around the sun.