1.You should have put the milk in the ice-box; I expect it ______undrinkable by now.

A.became B. had become C.has become D. becomes

Best Answer:C

详解：答案为C。与by now,so far, tip to now这样的短语连用时，谓语动词用现在完成时。

2.The tendency to lie is perhaps _________originally by imitations. It grows into a habit, unknown to its possessors.

A. taken to B. taken over C.taken in D. taken up

Best Answer:D

详解：答案为D。take to表示“喜爱”;take over表示“接管”;take in表示“欺骗”;take up表示“接受，形成”。

3. There were no tickets ______ for Friday's performance.

A.preferable B. considerable C.possible D. available

Best Answer:D

详解：答案为D。词形辨析和句意搭配题。以"-able"或"-ible"结尾的形容词表示被动，意为“可…”或“值得…”的意思。preferable指“更可取的，更合意的”;considerable指“可观的，相当多的.值得考虑的”。possible指“可能的”。

4.Don't _______ this news to the public until we give you the go-ahead.

A.release B. relieve C.relate D. retain

Best Answer:A

详解：答案为A。词形辨析题。release news指“泄露消息。”其余不构成搭配。relieve 指“减轻、缓解”。relate指“叙述、连接”;retain指“保留、维持”。

5.The actual _______by which coal is extracted is well worth watching.

A.process B. procession C.pattern D. conduct

Best Answer:A

详解：答案为A。process表示“步骤，程度，制作方法”;procession表示“行进的队伍”;pattern表示“模式，方式”;conduct表示“行为，方式”。