—It’s dangerous to swim here. Look at the sign!
—Oh, I _______ it.
A. didn’t notice B. don’t notice
C. hadn’t notice D. haven’t notice
—Will you give me a hand? I have some trouble_______ the scientific problem.
—Don't worry. I'll try my best to help you _______.
A. solving; in five minutes B. to solve; in five-minute
C. to solve; after five minutes D. solving; after five-minutes
You’d better_______ your cigarette when you are in the wood.
A. put on B. put up
C. put out D. put off
—What will the weather be like tomorrow?
—It _______ be rainy, cloudy or sunny. Who knows?
A. must B. might
C. shall D. should
—_______ are you leaving for Shanghai?
—In a couple of months.
A. How long B. How often
C. How soon D. How fast
—This is _______ fascinating museum I have ever visited.
—Yes. I’ve never seen a _______ one.
A. the worst, bigger B. the most, better
C. the better, the best D. the worst, good
