Which do you enjoy ____ your weekend, swimming or fishing?
(2012重庆卷)—Coach, can I continue with the training? —Sorry, you can’t ______you haven’t recovered from the knee injury.
(2012湖南) ____ I always felt I would pass the exam, I never thought I would get an A. A. While B. Once C. If D. Until
____ hard you try, it is difficult to lose weight without cutting down the amount you eat.
(2012江苏卷)One's life has value one brings value to the life of others.
I think Tom, as the head of a big department, should either study regularly or ________ his job.