1. We can always work toward improving our self-control, and, [   ], we can help others do the same.


2. I like all [   ] of music—pop music, country music, jazz and so on.


3. The main thing that makes mobile phones [   ] harmful is radiation.


4. My son is [   ] of the dark, so he never walks out of the house after sunset.


5. 《Susan》: I'm going to Tokyo on vacation next week. 《Alice》: Oh, how nice! [   ] 《Susan》: Thanks a lot.


6. [   ] before the twentieth century, traders carried coffee from Africa to Arabia.


7. [   ] are those who act in contradiction to their stated beliefs or feelings.


8. A single bacteria, __ the right conditions, divides rapidly into colonies of billions in one day. 


9. Employees are required to follow the standard operating procedures and to act [   ].


10. Nick: May I speak with Sharon, please? Betty: I'm afraid you [   ] the wrong number.


11. The representatives, with cigarettes in their hands, [   ] over a few details when suddenly smoke detector set off the fire alarm.


12. China is calling for a new global currency [   ] the dominant dollar.


13. Library users will be fined for returning books after the [   ] date.


14. Oscar doesn’t like to watch baseball games. [   ] does his twin brother.


15. The field is too barren to yield crops, so the farmers decide to put some [   ] on it.


16. There is a risk that the longer people put off their work, __ it will eventually get done. 


17. A:Why did Judy leave? B: [   ]


18. Tammy often [   ] music from the Internet to her MP3 player.


19. The man spent so little time with his family __ his daughter didn’t even recognize him. 


20. Defined most broadly, folklore includes all the customs, beliefs, and traditions that people have __ from generation to generation. 


21. I received a written [   ] from the student who bullied his classmates last week. He said he was very sorry about what he did.


22. Nowadays, many industries try to do something for     problems. They know the earth is greatly damaged by pollutants. 


23. In the previous year, you [   ] ballpoint pens and pocket calendars to my school. Will you do the same this year?


24. Most of the people in my office want to stay [   ], so they exercise regularly.


25. We should work together [   ].


26. 《Ken》:I have two tickets to the basketball game tonight. Would you like to go? 《Tim》: [   ]《Ken》: Why can’t you go? 《Tim》: I’ve got to hand in a 10-page report tomorrow morning and I’m still working on it.


27. Accounting is a profession [   ] has always interested me.


28. 《Clerk》: Can I help you, Sir? 《David》: Yes. I want to buy a pair of jeans, Size L. 《Clerk》: I have several in your size. [   ]《David》: Yes, of course.


29. If I were you, I would purchase more insurance, just for your own [   ].


30. A:I’d like to know whether foreign banks earn less profit when they deal with small firms instead of large conglomerates. B:[   ] They earn more. A friend of mine told me so.


31. Of all the novels I’ve read, this one is [   ] interesting.


32. Little kids begin learning their mother tongue by [   ] what they hear around them.


33. A:Hey, Paul. I see you walking lame all the way. [   ]? B:Nothing. I just sprained my ankle while playing basketball the day before yesterday.


34. I suggest you [   ] the Internet because a lot of people have experienced the same problem before.


35. According to the new tax laws, your tax will increase [   ] your income. The more money you make, the higher your tax is going to be.


36. Tom comes from a wealthy family, but John does not. In spite of their different [   ], they have become best friends.


37. Do not forget your ticket! Only ticket-holders will be [   ] to the concert.


38. I haven’t decided when I’m __ New York. I’ll let you know once I get the flight ticket. 


39. Las Vegas is a tourist [   ]. It's a must-go place for visitors who go to the U.S. for vacation.


40. The museum’s main hall [   ] an enormous book, and its restaurant looks like a big cake.


41. Parents should have [   ] rules for their children. These rules should not change according to parents’ mood.


42. Although experts agree that it is vital to eat a good breakfast, not many people are [   ] their advice.


43. [   ] working part-time at a fast-food restaurant, Monty has made enough money to pay for his studies.


44. The luxury tax is set to [   ] on July 1, but it has already dampened enthusiasm in the real estate market.


45. Where did you have your hair [   ]?


46. A: Quiet down, or you may disturb the neighbors. B: [   ]


47. It is essential that officials at all levels of government refuse to accept [   ] from business interests.


48. On the average, a healthy heart [   ] to pump five tablespoons of blood with every beat.


49. A: What do you usually do in your spare time? B: [   ]. I enjoy doing this especially after a stressful day.


50. You should have finished this work a week ago, but you didn’t. I think you should give me an [   ].