.In my opinion, life in the twenty-first century is much easier than _______.
A. that used to be B. it is used to C. it was used to D. it used to be
.He said he _________ experiments those days.
A. was doing B. had been doing C. has been doing D. is doing
There was a heavy curtain ________ the light.
A. blocking out B. preventing fromC. blocking in D. taking off
.Since I came here two years ago, great changes __________ in the factory and many people want to come here to pay a visit.
A have been taken place B. had been taken place C. have taken place D. are taking place
----Guess what ! I came across a friend at the party last night.
---- ________. I am sure you had a wonderful time.
A. Sounds good! B. Very well. C. How nice ! D. All right.
I ________along the street looking for a place to park when the accident_______.
A. went; was occurring B. went; occurred
C. was going; occurred D. was going; had occurred
