She is an excellent student in our class, and she always________ herself in her studies.
The manager came over and asked the customer how____
____he does has nothing to do with me.
This is the house _________ the great man Mao Zedong was born 110 years ago.
Then arose the question _________ we were to get so much money.
China’s success in manned-space-craft travel shows _________ out country has become one of the greatest powers in space research.