Professor Lee failed many times but he ________found a good way to solve the problem.
A．gradually B．entirely C．finally D．frequently
Ladies and gentlemen, please fasten your seat belts. The plane________.
A. takes off B. is taking off C. has taken off D. took off
The lady insisted that the young man ____her wallet and____to the police station at once.
A. had stolen; be sent B. should steal; sent
C. has stolen; sending D. steal; had been sent
Many students believe the choice of their courses and universities should ______ their own interests.
A．be based on B．based on C．be basing on D．base on
I’ve got to go now. Something has just _________ at school and I’m needed there.
A. come to B. come in C. come up D. come over
The Australian boy has a good _____ of Chinese and can communicate with others freely.
A. request B. command C. demand D. usage
