9．19．How many hours of sleep do teenagers need every night？ A．Between 9 and 10． B．Between 10 and 11． C．Between 9 and 11． 20．When should teenagers go to bed at night to get enough sleep？ A．Before 10：30 p．m． B．At around 10：00 p．m． C．After 10：30 p．m． 21．How do they feel when teenagers don't get enough sleep？ A．Unhappy． B．Excited． C．Angry． 22．Where does Tom's mother work？ A．In．school． B．In a hospital． C．In a music club． 23．Who wants to learn Chinese？ A．Tom's brother． B．Tom's father． C．Tom． 24．How often does Sam go swimming？ A．Every afternoon． B．Twice a week． C．Five times．week 25．What lessons does Tom want to take on Fridays A．Music lessons． B．Piano lessons． C．Guitar lessons．
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