Chia động từ.
1. We should prevent children (watch)____________those bad films.
2. We haven't decided on the menu yet, let alone (buy)_________the food.
3. I (buy)______  the book, but when I (hear)__________the opinion of the critics, I (change)________my mind.
4. It's time we (go)________. If we (not leave)_________now, we (miss)______the last train.
5. I (call)______for you five minutes. You (not hear)________me?
6. Their telephone (not answer)__________. They (go) _______out.
7. After I decided (have)_______a garage (build)________next to the house, I hired a carpenter (do)______the work.
8. I couldn't resist (laugh)______at the way he (answer)_______my question.
9. MR.Ba retired at the age of 70, (spend)_______nearly 40 years with the company.
10. I suddenly felt an insect (crawl)________up my leg.