The Chinese people are kind and caring. If not, I _____ in China in the past 30 years.

A. didn’t stay B. hadn’t stayed

C. couldn’t stay D. couldn’t have stayed

---It’s so cold outside. ________ I fetch you a coat, Grandma?

---Yes.Thanks a lot. You are always so considerate, dear.

A. Can B. Shall

C. May D. Will

I would persuade her to make room for you ______it be necessary.

A. could B. might

C. should D. would

“Learn through use” is a good piece of ________ (advise) for those who are studying a new language.

I'll stop and take a deep ____.

We don’t have to take great pains to control waste, but action and a grateful heart are needed; thank the water that runs through our fingers, and save it for poor Arabian or African countries struggling in water ______ (short);

With the ____________ (develop) of industry, air pollution is getting more and more serious.

Air pollution is caused by the following _________: about half of the problem is caused by vehicles.

If everybody realizes the ___________(important) of environment and does something to stop pollution, the problem will be solved.

I left it early because I had an appointment ______ (late) that day.