If nobody (have) … ……. . bought that car from the dealer, then you should return and make another offer

20.If nobody (have) … ……. . bought that car from the dealer, then you should return and make another offer. 
21. The news about Mr Hogan (be) __ _________surprising.
22. Fifty minutes (be)___ ________the maximum length of the time allowed for the exam.
23. Many people in the world (not have) __ _________enough food to eat.
24. The poor (need)___ ________ help from the community.
25. Listening to loud music at rock concerts  (cause)_ ______ hearing loss in some teenagers these days.
26. There (be) ____ _______a lot of sheep in the field.
27. Ten miles (be) ___ ________ too far to walk.
28. Not only John but also his friends (want) __ _________ to buy this race horse.
29. A number of students (recently participate) _ __________ in intensive language programs abroad.
30. Sarah, along with 20 students, (plan) __ _________a party now.
31. The number of students who (withdraw) _ __________from class since the term began (be) ___ ________quite high.
32. There (be)                      at least one window in every room.
33. A lot of students in my class (speak) _ __________ and (undrstand) ___ ________ Spanish.
34. The trousers Lan’s bought (not, go) ____ _______ best with her shirt.
35. The information she gave me (be not)  ___________valuable.
36. The number of days in a week (be) __ _________seven.
37. Either you or he (have) ___ ________to do the task.
38. Two years without a job (be) _ __________too long to be.
39. Every girl and boy (be) ______ _____required to have certain immunizations before enrolling in public school.
40. Neither of John’s parents (be)__ _ ________ English.( sau neither of có thể dùng động từ số ít hoặc số nhiều)