完形填空虽然注重考查语境理解，但同时也会考到一些固定句型，考生掌握好这些句型，对确定题目的答案很有帮助。如：
I haven’t had a phone in the house for three weeks now, and it’s several days ___19___ I used a phone box.
19. A. as B. when C. if D. since
【解析】本题考查的是it’s…since…句型，意为“自从……已（多长时间了）”。这句话的意思是“自从我上次打投币电话已经有好几天了”。
It wasn’t long ___18___the police caught the thief.
18. A. after B. when C. before D. until
【解析】It wasn’t long before…是常用句型，意为“不久就……”。这里说的是不久警察就把小偷捉到了。
“Why ___14___ you take a big man with you? You have to fight the sailor who is drunk.”
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