Don’t play a joke ________people in trouble.[ ]

Liu Guozheng must keep the record lifting(举重) .[ ]

How do you study English so well? —I think _________ English movies is a good way to learn English.

____Do you mind if I open the windows? _____ ______ I feel a bit cold.

_____ do the students do after-school activities every day ? For more than one hour.[ ]