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        71. A 72. D 73. B 74. B 75. C 76. D 77. C 78. C 79. B 80. A
       
        81. D 82. A 83. C 84. D 85. A 86. D 87. B 88. B 89. C 90. A
       
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        In the month of September, in Britain, you may see large numbers of birds 71)________ on roofs and telegraph wires. These birds are swallows. They are 72)________ together because, very soon, they will be flying 73)________ to much warmer lands, where they will find 74)________ the small flying insects on which they 75)________. There are no such insects 76)________ in Britain during the winter; it is 77)________ cold for them.
       
        The swallows settle, fly, swoop, and 78) ________ again. This they do many times, for they are making short 79)________ flights in order to be fit for the long journey 80)_______ them.
       
        81) ________ of these migrating birds leave Britain in the autumn. They fly 82)________ for hundreds of miles 83)________ they reach the warm lands of Africa. But not all the birds get there, for many of them perish in the stormy weather they meet with 84)________.
       
        In the spring of the following year they 85) ________ the long and tiring journey back to Britain. They return to the identical barn or tree in the 86)________ district which they had left the 87)________ autumn. How do these birds find their 88)________ there and back over such vast distances? Nobody knows exactly 89)________, but it has something to do 90)________ winds and air currents.
       
        71. A. being perched B. perched C. being perching D. be perched
       
        72. A. gathering B. assembling C. waiting D. forming
       
        73. A. to south B. the south C. to southwards D. south
       
        74. A. great number of B. a great deal of C. plenty of D. numerous
       
        75. A. feed B. are fed C. eat D. rely
       
        76. A. near B. about C. nearby D. over
       
        77. A. too B. a bit C. very D. much
       
        78. A. fly off B. swoop C. settle D. turn back
       
        79. A. practical B. practicing C. practice D. practised
       
        80. A. in advance B. ahead of C. in front of D. in front
       
        81. A. Swarms B. Herds C. Flocks D. Schools
       
        82. A. firmly B. stoutly C. harshly D. steadily
       
        83. A. until B. before C. when D. as
       
        84. A. in the way B. on the way C. half the way D. all the way
       
        85. A. have B. fly C. find D. make
       
        86. A. old B. original C. familiar D. identical
       
        87. A. before B. previous C. above D. former
       
        88. A. way B. path C. course D. route
       
        89. A. why B. when C. how D. what
       
        90. A. against B. away C. for D. with
       
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        71. B 72. A 73. D 74. C 75. A 76. B 77. A 78. C 79. C 80. B
       
        81. C 82. D 83. A 84. B 85. D 86. D 87. B 88. A 89. C 90. D