---Excuse me, could I take this seat?---Sorry, __________.
You _____ __ wash your hands before meals. It is good for your health. A. must B. can C. have to
— May I ask you some questions? — ______________ A. Yes, he may. B. Sure, go ahead. C. Of course not.
You’d better _______ too much meat. You are much too fat. A. not eat B. don’t eat C. not to eat
We should take care ________ ourselves. A. to B. for C. of
—What’s wrong with you? —Don’t worry. It’s ________. A. nothing serious B. serious nothing C. serious something