________hard you try, it is difficult to lose weight without cutting down the amount you eat. [ ]

John opened the door. There _____ he had never seenbefore.

The new film The Left Ear by Su Youpeng a few months ago, who is also a famous singer.

Why are you in such a hurry, John-There____a basketball match between Class Three and our class in ten minutes.

Without facts, a person can not form a correct opinion, for he needs to have actual knowledge ______his thinking .