56. Would you please give him this message the moment he ____?　 (arrive)

Arrives

55. Unless he ___ to help us , we shall lose the game.　　　　　 (promise)

promises

54. The Anti-Japanese War ___ in 1937 and it ___ eight years.　 (break out，last)

broke out; lasted

53. When the speaker entered the hall, all the listeners ____ .　　　 (seat)

were seated

52. They ___ last week after they ____ several years.　　　　 (marry，engage)

got married; had been engaged　

51. Great changes ____ in the city, and a lot of factories ____. (take place，set up)

have taken place; have been set up

50. The last time I went to my hometown, a big factory ___ there.　 (build)

was being built/had been built

49. It’s high time we ___ a holiday.　 　　　　　　　　　　　　　(have)

had

48. I ____ in Xi’ an for ten years by next May.　　　　　　　　　 (live)

will have lived

47. Oh, it’s you! I ___ you ____ out.　 　　　　　　　　　　　(think，be)

thought; were