—Can you tell me if Tom has finished his homework?

—I've no idea. He ________ it this morning.

A．has being doing B．had done

C．is doing D．was doing

Besides the content of a book, ________ the editor also cares about is the number of readers.

A．who B．why

C．how D．what

The organizers promise ________ wins the first prize a chance to go abroad.

A．who B．whom

C．whoever D．whomever

Mary is a humorous and warm?hearted woman and that is ________ she is a most popular person in her community.

A．whether B．because

C．how D．why

________ she was invited to the ball made her very happy.

A．Whether B．That

C．Because D．What

________ is the most important for him is not his job, but his family.

A．It B．As

C．What D．That

Energy, passion and a burning desire are, you see, ________ true learning takes.

A．that B．what

C．how D．which

In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work.

A．whether B．why

C．how D．that

After ________ seemed a hopeless wait, four coal?miners trapped in the mine for 125 hours were finally rescued in Heilongjiang Province.

A．when B．that

C．it D．what

Israel was created as a homeland for homeless Jews after World War Ⅱ. However, the creation of Israel in ________ used to be Palestine left many Palestinians homeless.

A．what B．which

C．where D．that