7（）

A．before
B．after
C．first
D．so

Peter"s job was to examine cars when they crossed the frontier to make sure that they were not smuggling anything into the country. Every evening he would see a factory worker coming 1 the hill towards the frontier, 2 a bike with a pile of goods of old straw on it. When the bike 3 the frontier, Peter would stop the man and 4 him take the straw off and untie it. Then he would examine the straw very 5 to see 6 he could find anything, after which he would look in all the man"s pockets 7 he let him tie the straw again. The man would then put it on his bike and go off down the hill with it. Although Peter was always 8 to find gold or other valuable things 9 in the straw, he never found 10 He was sure the man was 11 something, but he was not 12 to think out what it could be. Then one evening, after he had looked 13 the straw and emptied the worker"s pockets 14 usual, he 15 to him, "Listen, I know you are smuggling things 16 this frontier. Won"t you tell me what it is I"m an old man, and today"s my last day on the 17 . Tomorrow I"m going to 18 I promise I shall not tell 19 if you tell me what you"ve been smuggling." The worker did not say anything for 20 Then he smiled, turned to Peter and Said quietly, "Bikes."