“He hasn't got any hobbies——_______you call playing games on computer a hobby.” Mr. Lin said.

Scientists say it may be five years ______ it is possible to test this medicine on human patients．

       he can pass the entrance examination is quite uncertain.

He does so little work in the office that for all practical purposes it would make no difference _______ he didn’t come.

 ________ hard you try，it is difficult to lose weight without cutting down the amount you eat.(2012·湖南)