完形填空 阅读短文, 从每题所给选项中选出可以填入空白处的最佳选项。（共15小题；每小题1分，满分15分）
Peter’s job was to examine cars when they crossed the frontier（国境） to make sure that they were not smuggling(走私) anything into the country. Every evening he would see a factory worker coming   1  the hill towards the frontier, pushing a bike with a pile of goods(货物) of old straw on it. When the bike   2  the frontier, Peter would stop the man and   3  him take the straw off and untie（解开） it. Then he would examine the straw very   4  to see   5   he could find anything, then he would look in all the man’s pockets   6  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   7  to find gold or other valuable things hidden in the straw, he never found anything. He was sure the man was   8  something, but he was not  9  to think out what it could be.
Then one evening, after he had looked through the straw and emptied the worker’s pockets   10  usual, he   11  to him, “Listen, I know you are smuggling things  12  this frontier. Won’t you tell me what it is? I’m an old man, and today is my   13 day on the job. Tomorrow I’m going to retire(退休). I promise I shall not tell  14  if you tell me what you’ve been smuggling.” The worker did not say anything for   15 . Then he smiled, turned to Peter and said quietly, “Bikes.”

---Oh, you are here. I’m looking for you all the morning.      ？
---To the library

1. A.
   Where have you gone
2. B.
   Where will you go
3. C.
   Where are you going
4. D.
   Where have you been?

Don’t make him __________ all the cleaning alone. After all, he is so young.