We often associate the name of Li Ning ______ gymnastics.

______ the cold, thin air and low oxygen levels also can cause mountain sickness.

She knows nothing about her new neighbor________he moved into the building last Sunday.

The couple are at the same age, but           , the husband looks much older than his wife.

Seriously damaged, the bike is no longer          .

The shop was not far from here, so they went there on foot        by bus.

Learning foreign languages calls for your memory,time,patience and emotions._______,it is not a simple thing. 

Students should respect teachers and parents _______ just thinking for themselves.

He is ____our teacher; he is also our best friend.

Sometimes proper answers are not far to seek ______ food safety problems.