Scientists say it will be five or six years ________ it is possible to test this medicine on humans．
| A．after | B．before | C．since | D．When |
— Here is some good news for you. You’ve won a holiday to the USA.
—______ That’s great!
A. Have I? B. Pardon? C. Congratulations! D. Good idea!
.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 placeD. 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 |
They _________ laughing when they heard his funny voice.
| A．burst out | B．fell about | C．felt about | D．burst into |