You can never imagine the great difficulty I had ______ her QQ number.
It is snowing outside. Why not close the door to_________ the cold air?
must I take this medicine every day? —Three times a day. [ ]
Mr. Wang is going to meet Kitty and _____ at the school gate tomorrow morning.
Daily Mail of November 25th reported that American astronomers (天文学家)______aplanet that was most similar to the earth.