用括号内所给动词的适当形式填空。

1. — What's your plan for the coming holiday? 

    — I ________ (visit) Window of the World in Shenzhen if possible.

2. The disabled mustn't ________ (laugh) at by anybody.

3. The teacher told me I ________ (improve) my English if I tried my best.

4. I was told when I was young that Shanghai ________ (lie) in the east of China.

5. When I dropped in, Mr. Sun ________ just ________ (leave), so we had little time to chat.

6. How unlucky he was ________ (fall) off the bike yesterday!

7. I saw you carelessly ________ (throw) some litter on the ground. You'd better pick it up.

8. Because I ________ (lose) my bicycle, I have to walk to school.

9. ________ both of you ________ (write) down all the questions by the end of the last class?

10. The new model of the mobile phone you look forward to ________ (sell) out yesterday.