1.The new law has come into effect, and number of wild animals here is on____increase now.
A. the; the B. a; the C. the; / D. a; /
【答案】A
【解析】
【详解】考查冠词及固定搭配。句意：新的法律已经生效，野生动物的数量正在增加。由谓语动词is可知主语是the number of...，the number of...为固定搭配，意为“……的数量”；on the increase是固定搭配，意为“在增加”。根据语境可知，选A。
2.David asked his nephew to ______ his bag while he headed for a drink at the airport.
A. run out of B. keep an eye on C. make up for D. take advantage of
【答案】B
【解析】
【详解】考查动词短语。句意：在机场中当David去喝东西的时候，他请求他的侄儿照看他的包。A. run out of用光，用完；B. keep an eye on照看， 照管，留心；C. make up for 弥补，补偿；D. take advantage of利用。结合句意，David离开，则需要有人看包，使用keep an eye on恰当。故选B。
3.Sorry, I would have come earlier, but I ______ that you were waiting.
A. didn't know B. hadn't known
C. don't know D. haven't known
【答案】A
【解析】
【详解】考查时态。句意：我本应该早点来，但是我不知道你在等我。I would have come earlier是对过去的虚拟，but后面的内容是描述过去的事实，用一般过去时，故选A。
