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

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

--- 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

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

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