III. Put the verbs in brackets in the correct form:
11. You (not get) _________what you want unless you work harder.
12. The teacher said this water (be) _________too contaminated to be used.
13. Development in medical science (help) _______people live longer in the future.
14. If we had flying cars now. we (solve) _______the problem of traffic jams.
15. Anna said she (be) _______going to leave when Tom came.
16. My family (attend) _______a flower festival this time next week.
1 7. The mother told her son (not behave) _______:so impolitely. 1
8. Phong said that he (help) _______his parents to clean the house at 4 A.M the previous day.
19. By the time you receive the letter. I (leave) _______for Paris.
20. By this time next summer, you (complete) _______your final exam