Li Qi is ______ excellent singer. He won the first place in The Voice of China.
A. a B. an C. The

--- How long have you worked in this town?
--- ________ October 21, 2001.
A. Since B. For C. On

--- Where is LiLy? I can’t find her.
--- She __________ a disabled children’s home to help them.
A. has been to
B. has gone to
C. has been away

Don’t give up, __________ you will succeed one day.
A. or B. but C. And

Because of the 2008 Olympic, great changes have _________ in Beijing.
A. taken place B. improved C. happened