23. He sat under the tree, with his eyes ____ upward and his fingers___.

A. looked, crossed　　 B. looked, crossing

C. looking. Crossing　 D. looking, crossed

22. I wouldn’t think it ____ to ask him to ____ the club he’ll only refuse.

A. worthwhile , join　　　　 B. worthwhile , join in

C. worthy , join　　　　　　 D. worthy, join in

21.The medicine ________ as soon as you take it. But it ________ the blood.

A. bring into effect , effects　　 B. takes effect, has a bad effect on

C. comes into effect, has little effect on

D. is carried into effect, has much effect on