下面哪个短语用于讲故事的开头比较合适？
A. Once or twice B. From time to time
C. Once upon a time D. For the first time
You will have a better chance _____ passing your exams if you work harder.
A. of B. at C.in D. To
— Where is your father now?
— I’m not sure. He be in the kitchen.
A. must B. may C. can D. need
It’s difficult to live in a foreign country, if you can’t speak foreign languages.
A. mainly B. really
C. luckily D. especially
—Can you finish the work in an hour?
—____________.
A. No problem B. That’s all right
C. We don’t believe it D. Good idea
There are ________ books in the National Library.
A. twenty millions B. twenty millions of
C. twenty million D. twenty million of
