51. My brother ________(make) many American friends since he went there two years ago.

　　52. She _______(work) in a factory for three years before she went to college.

　　53. Mr. Brown ___(live) in London for ten years by the end of last month.

　　54. How many English words _________ you _________(learn) by the end of last term?

　　55. ______ they _______(pick)all the apples before the farmer got there?

　　56. I didn't return the book to the library，because I _______(not finish) reading it.

　　57. The boy said that he ___________(not break)the window.

　　58. Jack said that he ___________ (not go) over his lessons yet.

　　59. John told me that he ____ (fly) to Japan next Wednesday.

　　60. Did she say when she ___________ (be) back tomorrow?

　　61. The head master said he ________ (meet) some foreigners at the station soon.

　　62. I wondered if our team ___________ (win) this evening.

　　63. He said he _______ (not make) the same mistakes again.

　　63. He said he _______ (not make) the same mistakes again.

　　64. We ____ (have) a meeting at that time.

　　65. Tom ____ (not have) breakfast yesterday morning.

　　66. Did he know he ____ (have) an English lest the next day?

　　67. _____ your father _____ (go) to work by bike every day?

　　68. Mr Wang _____ (teach) us maths since 1990.

　　69. They will have a trip to the Great Wall if it ____ (not rain) next Sunday.

　　70. When I got home my grandmother ________(make) cakes.

　　71. I ______ (give) the note to him as soon as school is over.

　　72. The English song _____ (teach) now over the radio.

　　73. English _____ (speak) all over the world.

　　74. The Great Green Wall must _____ (build) in the world.

　　75. Can the report ____ (write) in English?

　　76. The mountain will __ (cover) with the trees in a few years.

　　77. The young trees must _____ (tie) to the stick to keep it straight.

　　78. So far, many man-made satellites have ___ (send) up into space.

　　79. English ___________ (speak) in Canada.

　　80. Tennis ___________ (invent) a hundred years ago.

　　81. It ___________ (snow) hard now. We'd better ___________ (not go) home right now.

　　82. These exercises must ___________ (do) by yourself.

　　83. Our teacher told us time ___________ (be) life.

　　84. We ____ (not see) each other since he ______ (leave) here.

　　85. ___________you ever ___________(ride) a horse before?

　　86. Miss Green ___________(be) in China for 6 years.

　　87. We ___________ never ___________ (be) to Hawaii.

　　88. You'd better try to give up ___________ (smoke). It's too bad to your health.

　　89. Who is doing well in ___________ (describe) things?

　　90. Have you finished ___________ (read) the book?

　　91. Have you saw someone ___________ (ski) before?

　　92. —Can a shark stop ___________ (swim)? —No, It can't

　　93. You'd better try ___________ (do) it by yourself.

　　94. The students kept ______(talk)about the football match.

　　95. I had a computer lessons first. Then I went on ___________ (have) tennis lessons.

　　96. He hopes ___________ (see) the famous football player as soon as possible.

　　97. The boy kept ___________ (ask) strange questions to his teacher, it made the teacher unhappy.

　　98. Edison enjoyed ___________ (try) his new ideas.

　　99. He asked me ___________ (speak) loudly.

　　100. Students must study hard __________ (make) our country strong.