Mr Obama, who appeared to take the lead in the race in most battleground states, seemed to______ an air of caution throughout the first Presidential debate

In dealing with public relations,we should make every effort to prevent the __________ in personality.

What were you doing when the earthquake happened in Jianhe —I morning exercises.

Ladies and gentleman, please fasten your seat belts! The plane ________

nderson is popular with his students, for heis kind, strict and knowledgeable.— No wonder he has such a good_________.