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


2.     I read the proposal     the budget was so high. 


3. I think I should be going now. I’ve got to [   ] my son at the school in ten minutes.


4. It is true that the surroundings will [   ] one’s work and studies.


5. Students must study hard, [   ] they will fail the test.


6. We are so glad that Miss Snow is teaching [   ] English.


7. You are the leader of this team; therefore, you need to listen to your members’ ideas and write down [   ] points for later discussion.


8. Please turn off the light. We should save [   ]; otherwise, the bill might go up again.


9. 《Martin》: I did terribly at the math exam. I don’t think I will pass. 《James》: [   ] You’ve spent too much time playing the computer games lately.


10. In this industry, you really need to keep [   ] if you don't want to be caught off guard.


11. Not only [   ] most male birds have extremely beautiful feathers, they know how to use them.


12. All of [   ] have joined the on-the-job training.


13. All employees are required not to discuss     information about the company. 


14. Most students think that there is a need to [   ] bus fare, but not all students agree to have the fare increased by 35 percent.


15. The key players in the energy market, [   ] heavy capital investment, have little interest in innovation.


16. High school students in Taiwan often [   ] that preparing for tests keeps them from having enough sleep.


17. Snow [   ] more solar radiation than liquid water. Therefore, don’t forget to protect your eyes when you go skiing.


18. By that time the theater was already [   ], so we had to buy tickets for the next day.


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


20. He went for an ocean voyage and __ his health. 


21. [   ] the family income, the Chang's could afford to buy a new car.


22. This contract is [   ] approval by both parties involved.


23. Historical insights serve to clarify and [   ] the critical activity of a period.


24. 《Doris》: Did you sleep well last night? 《Jennifer》:No, I had an awful night. [   ] in the middle of the night, and couldn't get back to sleep.


25. He can type very fast. He __ type 80 words a minute. 


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


27. After eleven o’clock in the evening, the bus is empty __ the driver and the conductor. 


28. It is reported that there’s [   ] tension between the refugees and the local population in Pakistan.


29. Many schools no longer ask students to wear [   ] nowadays.


30. __, I cannot agree with him on the matter. 


31. Seasonal flu vaccinations began yesterday, leading to long lines at hospitals and health centers [   ] the island.


32. The suppliers will claim compensation if we partially [   ] our contract with them.


33. From now on, any employee who is usually late for work will be [   ].


34. The average was down [   ], went briefly into the black around lunchtime, then ended with a loss of 139.


35. Athletes always wear clothes made of [   ] materials, so they may stretch their bodies without difficulty.


36. My grandfather [   ] for ten years, but I still miss him a lot.


37. It’s a pity that I failed again. If I had read the book carefully,     the test. 


38. A brand brings a set of __ in the mind of the consumer and one of these is the country of origin. 


39. 《John》: How often do you exercise? 《Amy》: [   ] 《John》: That’s great. No wonder you keep in good shape.


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


41. Small businesses usually can respond to new market     fast and make necessary changes. 


42. It [   ] me two hours to get there because the traffic was awful.


43. 《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.


44. It's getting late. Let's [   ].


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


46. ____ for the sales in the first quarter may not necessarily be the final sales volume at the end of the quarter. 


47. Janine will probably lose her job [   ] her boss in front of the entire staff last week.


48. Steve Jobs’ ____ mastery of technological innovations and aesthetics successfully transformed the landscape of consumer electronics industry. 


49. The manager talks as if he     mad at you, but this is just the way he talks to everybody. 


50. I’m not [   ] you! Our team has just won both the gold medal and the silver medal.