In this country, the quality of foodproduct is _____ according to the highest international standard.

The women under the tree are _______ mothers. They are old friends.

Is Professor Smith giving the speech today——It ______ be him. He is abroad right now.

What do you think of the four classics (名著) of China—They are wonderful, but I’ve read of them.

He didn’t get up ________. So he didn’t have _______to finish his homework.