All her time _______ research, the scientist has no time for films.
I got an e-mail from Liu Xin, ___ said she was going abroad for further study.
The fact that people are afraid to go out at night is often a result of perceived (感知) danger ________actual danger.
In Hangzhou, Mr. Black was so struck ______ the beauty of nature that he stayed ________ another night.
It is morning _____ we have four classes, not afternoon.
Mother told Jim to watch the milk until it boiled and then _________ off the gas.