Even if there is no scientific proof secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.
Ladies and gentlemen, please fasten your seat belts. The plane________.
The lady insisted that the young man ____her wallet and____to the police station at once.
Many students believe the choice of their courses and universities should ______ their own interests.
I’ve got to go now. Something has just _________ at school and I’m needed there.
The Australian boy has a good _____ of Chinese and can communicate with others freely.