Having been told that her son died in the accident, the old woman appeared very calm, as if nothing

I was so familiar with her that I recognized her voice __________ I picked up the phone.

________ their country has plenty of oil, ours has none.

His children are well-behaved, ___ those of his sister's are very naughty.

How can you keep fit____ you smoke so much every day?

You have failed two tests. You'd better start working harder, ___you won't pass the course.

How many more decades will have to pass __ scientists succeed in providing a cure for cancer?

Scientists say it may be five or six years _____this medicine is tested on human beings.

__ for a long time, but he tried his best to catch up with his classmates.

On no account _____held responsible for the accident.