I should not have laughed if I _________ you were serious.
A. thought B. would think C. had thought D. have thought
On the Eve of the Spring Festival, we Chinese people like to play with fireworks, and the noise doesn’t ________ until after midnight.
A. die from B. die off C. die out D. die down
The children, ________ had played the whole day long, were worn out.
A. all of what B. all of which C. all of them D. all of whom
We are confident that the environment ________ by our further efforts to reduce pollution.
A. improves B. will be improved C. has improved D. was improved
— Where did you find the professor who made the speech yesterday?
— It was in the hall_______ the students often have a meeting.
A. where B. which C. that D. when
When I first met Mary I didn’t like her, but I ________ my mind.
A. have changed B. change C. had changed D. would change
