---- Did he come back early last night? ---- Yes. It was not yet eight o’clock _______ he arrived home.

The policy of the mainland is very clear and straightforward，and the key problem is ______ the leaders of Taiwan will accept it.

_____ the heavy snow, I can’t go to school today.

One of them held the view ____ the book said was right.

_______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.