1. In the face of energy crisis, scientists worldwide are now exploring [   ] energy to replace fossil fuels.


2. Hotel guests who [   ] checking out after 1:00 P.M. should contact the front desk.


3. A few political extremists [   ] the crowd to attack the police.


4. When there is no [   ], you had better compromise; otherwise, you might be caught at a deadlock.


5. 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.


6. I was [   ] to find I did not have enough money to pay for the taxi fare. My face turned very red.


7. Research shows that only some animals are able to [   ] in the wild after being released from the zoo.


8. What can you tell me about [   ] the subway in Tokyo?


9. That is my [   ] favorite restaurant. The service is bad and the food doesn't taste good.


10. 《Sam》: Would you like to go swimming with me? 《Jane》: [   ]   I think I’m getting a cold.


11. You don't want to go to the party, [   ]? You look very sleepy.


12. You can never make him [   ] his mind.


13. The flooding after the typhoon [   ] many houses.


14. Free Spirit Team will probably [   ] the speech contest as it is much better than our team.


15. Two years ago a severe earthquake struck the city and caused a [   ] tsunami, leaving hundreds dead, thousands injured.


16. It has always been very generous     you to assist us in arranging the meeting. 


17. Those angry peasants held a sit-in [   ] make their protests against the new policy.


18. When the pop idol came to Taiwan, swarms of fans crowded the street outside the hotel, waiting for a [   ] of their hero.


19. We could have gone swimming if the weather [   ] warm and sunny.


20. Mr. Chang is a very successful salesman; he is very aggressive and always takes the [   ] in his work.


21. Jane got a high score on the English test today. She [   ] very hard last night.


22. A thorough analysis of market ____ can increase the success rate of a new product. 


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


24. He speaks English poorly. He can’t make himself [   ] in English.


25. I have lots of things to carry, but I have only two hands. Would you mind [   ] for me?


26. 《Ken》: Taxi! 《Driver》: Where would you like to go, sir? 《Ken》: [   ]


27. A: I love to look at the ancient art. B: [   ]We can learn a lot from them.


28. If the weather is good, we     the company outing as scheduled. 


29. Michelle often reviews research papers for one of the top journals in [   ] genetics.


30. [   ] warming has caused dramatic climatic changes in many areas around the world.


31. When we receive text messages of promotions from a company, we must be [   ] of possible false advertisement out of which the company wants to make profit.


32. 《Sylvia》: What's your favorite season? 《Amy》: [   ] 《Sylvia》: Me too. I hate cold winter days.


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


34. As the project depends on [   ] at the federal level, the city and county may have to wait until the budget cutting ends.


35. [   ] the lobbying groups been backing up the new protocol, but several industry labor unions are now voicing their stern support for it.


36. Among the things that money cannot buy [   ] good health in the mind and body.


37. The government is taking a very [   ] approach to managing this economic crisis.


38. U.S. Secretary of State Hillary Clinton said on Saturday the United States and China can help pull the world out of economic [   ] by working together.


39. Tigers are a(n) [   ] species, but they are still hunted for their bones and skins in some areas.


40. [   ], they would not have solved their financial problem.


41. Let’s [   ] jump to the conclusion, okay?


42. [   ] for the sales in the first quarter may not necessarily be the final sales volume at the end of the quarter.


43. ____ you encounter any problems regarding the new system, please notify the tech support ASAP. 


44. [   ] month of the year in Taiwan is usually December or January.


45. She can sing well and [   ]. That’s why her friends usually ask her to sing karaoke together.


46. Michelle would certainly have attended advisory board meeting __ on the highway. 


47. A: What’s for dinner? B: How about some sushi? A: [   ] I prefer a hot bowl of noodles to a cold dish. B: I see. Let’s have our dinner at the noodles stand across the street.


48. The government is figuring out ways to maintain our economic [   ] so that the unemployment rate will go down.


49. 《Tom》: Are you free tonight? 《Cathy》: [   ]《Tom》: Too bad. I was thinking maybe we could go see a movie tonight.


50. [   ] help us fly kites in spring and cool us in summer.