21. __________ sleep every night is important for teenagers. _________, loss of sleep can make you

feel tired, and even cause you to put on weight.

A. A good amount of; As a matter of fact        B. A good number of; In fact

C. A large amount of; As matter of fact         D. Plenty of; In a fact

22. The teacher insisted that the boy _________ wrong and that the boy ___________ at once.

   A. be; be apologized to         B. was; be apologized   

C. was; apologize             D. is; should apologize