单选题：_____ the news, so far, has been good, there may be bad days..

The landslide almost flattened the small town of Zhouqu, leaving 1,248 dead and 496 missing. I wonder how long it will be ____ the people there get over the shock.A. before B. whenC. since D. after

“No student,” the headteacher stressed, “_______ go out of the school after ten o’clock at night without my permission.”A．mustB．willC．shallD．may

He thinks I have spoken ill of him, ____ I'm always speaking well of him.A. whenB. and C. while D. on the contrary

I’m as busy as a bee; ________ you bother me with so many questions now?A．canB．shallC．mustD．may

It's difficult for any of us to eat better, exercise more, and sleep enough,_____we know we should.A. because B. even if C. as if D. unless