1. Every few years, the coal workers have (have) their lungs X-rayed to ensure their health.
2. Unless we act (act) now to protect the environment, we’ll live to regret it.
3. Hurry up, kids! The school bus is waiting (wait) for us!
4. The book has been translated into thirty languages since it came (come) on the market in 1973.
5. Jim was watching a late night film at home, when right in the middle of a thrilling scene, the television went(go) blank.
6. She is sixteen, who will be (be)seventeen next year.
7. They have made (make) rapid progress in the past few years.
8. Bob called(call) to tell his mother that he couldn’t enter the house.
9. Lucy had finished writing her essay by 10: 00 this morning. After that, she listened(listen) to music for a while.
10. So far we have been(be) able to find a good way to solve this problem.
