51. If you want to the job_________(do) before Friday, you’d better come to help us.

49. They will go outing if it ____________(not rain) this Sunday.

50 By the end of last week, four large bridges __________(build) over the river.

48. The excellent student asked __________(send) to the poorest area.

47. My little daughter can never keep still while her photograph_________(take).

46. My classmates _________(have) a party this time tomorrow.

45. It is the third time you _________(invite) to attend your students’ parties.

44. According to the timetable, the next train for Beijing ________(leave) at 8: 13.

43. The question __________(discuss) at the meeting at the moment.

42. A boy with one of his front teeth _________(miss) came into the classroom.

41. Ten years _________(pass) since then.