21. —You don’t look very ______. Are you ill?

—No, I’m just a bit tired.

A£®good            B£®well       C£®strong         D£®healthy

22. Rather than           on a crowded bus, he always prefers         a bicycle.

A. ride; ride         B. riding; ride    C. ride; to ride     D. to ride; riding

23.The famous basketball star, ______ tried to make a comeback, attracted a lot of attention.

A£®where       B£®when         C£®which          D£®who