21. The teacher (do)____________research in the library right now.

22. He usually (learn)________________his lesson in the evening but last night when I (get)___________to his house, he (listen)______________to the radio.

23. The earth (depend)_________________on the sun for its heat and light

24. Up to now, the teacher (give)________________our class five tests.

25. Some animals (not eat)_____________during winter.

26. When she (see)___________a snake at her feet yesterday, she (scream)__________________.

27. Yesterday when I (see)___________him, he (sit)___________asleep in an armchair.

28. Please be quiet! I (work)________________.

29. He (live)_______________near our house, but we (not see)_________________him very often.

30. I (not/ send)________________the parcel until I hear from you.

31. Long ago, my younger brother often (cry)_______________.

32. Last Saturday while Sandy (clean)_____________out the attic, she (find)_______________her grandmother’s wedding dress.

33. She (be)_______________ill for several months.

34. Mr Green (buy)___________a new tractor last month.

35. He thinks that it (rain)______________tonight.

36. He (lose)_____________his job last month and since then he (be)___________out of work.

37. ___________you (finish)___________your homework?

38. I don’t smoke while I (drive)______________a car.

39. Henry (eat)_______________a snack at midnight last night.

40. When he (receive)_______________the photographs, he will show them to you.

41. The leaves (fall)__________________from the trees when autumn (come)_________________.

42. I (receive)________________twenty cards so far.

43. In the 19th century, it  (take)________ two or three months to cross North America by covered wagon. The trip (be)________ very rough and often dangerous.

44. I (go)_____________ to the same barber since last year.

45. Ask her to come and see me when she (finish)_______ her work.