单选题：____ everyone knows about it, I don't want to talk about it..

——Shelooksveryhappy.Shehavepassedtheexam.——Iguessso.It’snotdifficultafterall.A．shouldB．couldC．mustD．might

Last month I came to Britain. My English has improved a lot _____ I use it all the time.A. since B. whileC. whenD. as

—Can I pay the bill by check?--- Sorry, sir. But it is the management rules of our hotel that payment ____ be made in cash.A．shallB．mustn’t C．can’tD．will

You’d better take another flight to New York , for the AA 505 Flight ______ have been cancelled. But you should call the airport to make sure. A．mustB．mightC．wouldD．should

— Don't you think we should ask Daniel what happened when we were away?— Maybe, but _____ he has been so rude to us, I feel like _____ him or he won't respect us.A. even though; to punish B. even if; punishing C. now that; punishing D. so that;