用括號中所給動詞的適當形式填空。

　　2. The teacher ________(look) at the clean classroom and said we had done a good job.

　　3. Anita ________(change) greatly in the last two years.

　　4. I heard her ________(sing) aloud in the next room at that time.

　　5. It was said that some foreigners ________(visit) Changsha the next week.

　　6. Why are there so many people over there? Let’s ________(go) and see what is going on.

　　7. ________(not make) so much noise, Tom. Dad is reading in the study now.

　　8. Look! Li Lei and Lin Tao ________(work) hard over there.

　　9. The swimmers of our school ________(get) many prizes in the competition last year.

　　10. I ________(return) the book to the library already.

　　11. You look so tired and need to stop ________(have) a good rest.

　　12. Something must ________(do) to build up a Great Green Wall successfully.