—You've made great progress in your studies of English, haven't you?
—Yes, but much________to be done.
| A．leaves | B．keeps | C．remains | D．has |
A long time _________ a person, which is really a truth.
| A．examines | B．checks | C．tests | D．experiments |
Mr. Mike doesn’t understand ________ made his wife so upset this morning.
| A．what was it | B．why it was that | C．how that was | D．what it was that |
－How much shall I pay for the phone call?
－You __________. This is free of charge.
| A．shouldn’t | B．can’t | C．needn’t | D．mustn’t |
．Mike didn’t notice Alice entering his room. He __________ a phone call.
| A．answered | B．has answered | C．was answering | D．is answering |
The policeman _______ the facts again and again, but couldn’t piece them together.
| A．got through | B．picked up | C．went over | D．turned over |