20. Can’t we just live in today, ________ the worries of tomorrow or the regrets of the past?

A. free from　　 B. aware of　 　C. sure of　　　 D. tired from

19. ---The Spring Festival is drawing near. Are you going home this year?

　 ---I haven’t decided yet. I ______ go home, but it depends on whether I can buy the ticket.

　　 　A. must 　　　　 B. shall　　　　 C. will　　　　 D. may

18.. The bill you sent me is incorrect, sir. ________, it isn’t the first time.

A. Worse still　　 B. On the contrary　 　C. For one thing　　 D. In all

17. ---Excuse me, may I ask you some questions?

　 　---Sorry, I’m too busy and haven’t even a minute to ______.

　 A. spend　　　　　　　 　 　B. spare　　　　 C. offer　　　　　　　 　 　D. devote