__________at the door before you enter the office，or you’ll be considered impolite
A. Knocking B. Knocked C. Knock D. To knock
It was March 14th．2013__________Xi Jin ping was elected chairman of the People’s Republic of China
A. in which B. that C. until D. when
Camacho，the former Chinese football coach，__________ in China between 2011 and 2013
A. have worked B．worked C. had worked D. works
—Mum, shall I watch the TV program Happy Camp today?
—__________.You have so much homework to do!
A. Forget it B. Not at all C. Go ahead D. That’s right
Last night on my way home I saw an old lady driving a BMW car
at __________I thought was a dangerous speed.
A. that B. which C. what D. how
Word came that Chinese sports delegation has won 9 medals in the 2014 Winter Olympics in Sochi，Russia, __________the 12th of the medal list.
A. ranking B. ranked C. to rank D. having ranked
