161.He hardly writes to you, _______ ?A. doesn't he B. does he C. do they D. has he
解析：该题答案为B，hardly否定副词，反问部分要用肯定形式。
162. _______ I accept the gift or refuse it is none of your business. A. If B. Whether C. Even if D. No matter when解析：该题答案为B。whether可以和or连用，if不可以，此外if一般仅用于宾语从句。
163. The way _______ these comrades look at problems is wrong. A. where B. in that C.X D. with which解析：该题答案为C，先行词是way，定语从句中用that或 in which来引导或不填。
164. ____a long time since I saw you last time.A．It was B. It is C. It had been D. It can be
解析：该题答案为B，It is +时间数+ since引导的从句是一个句型，意为"从…时候以来过了多久了。"
165. The chemical works _______ where my father has worked for thirty years in 1949.
A. was built B. were built C. is built D. are built 解析：该题答案为A。works形式上是复数，意思上是单数，因此谓语动词用单数，类似的还有news, maths, politics, physics.
166.They each _______ a copy of the new physics. A. have B. has C. having D. gets
解析：该题答案为A。They each不等于each of …, each of 这个词组作主语谓语用单数如each of the students hands in their homework，而they each作主语，谓语要随each前面的词来变化。
167.Not only ____ this machine but ____ it. A. can he run……can he repair B. can he run……he can repair
C. he can run……he can repair D. he can run……can he repair
解析：该题答案为B，在not only……but (also)句型中，只有but前面的部分倒装，but后面仍是正常语序。
168.____ that he went to sleep.A It was until midnight B That was until midnight
C It was not until midnight D That was not until midnight解析：该题答案为C。强调until结构时，要将否定词not移到until前。又如：He didn't leave until twelve 改为It was not until twelve that he left.
169. There are a lot of students ____ in the class room.A talk B talking C talked D to talk
解析：该题正确答案为B。 There be句型为倒装句，可换为A lot of students are talking in the class room. 又如：There is a lot of noise heard out in the street.
170. While ____my homework, I heard a cry for help.A do B did C doing D having done
解析：该题答案为C。该空处省略了I'm,相当于while I'm doing my home work.如：While playing guitar, he is singing.