31. Tom and his father_______America last week, and arrived there this Tuesday morning.

29. The computer system _______ suddenly while he was searching for information on the Internet.

25. —Your mother becomes more and more forgetful.
— Yes. She searched for her cell phone for a whole day last Sunday but it ______ in her coat
pocket the next day.

23. Don’t try to cheat the taxman(稅務(wù)人員); you’ll never ______it.

9. Please ______ your sister to bring the ticket for the concert.

8. Be careful ! The slightest spark could ______ the fireworks.

44. He ______ all his time and energy to his work．

40. It is obvious that lung diseases are____smoking.

23. In modern times, people have to learn to _____ all kinds of pressure although they are    
leading a comfortable life.

22. Please tell me how the accident_____. I am still in the dark.