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


2. We don’t need to [   ] what the future will hold; just focus on the present task.


3. The former CEO of Highhills Inc. was believed ____ a suicide. 


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


5. Robert can’t drive us to the airport. He has __ to take us all. 


6. Dr. Wilson, [   ] is the CEO of the company, will be here to give a speech at the opening ceremony next week.


7. As __ as it had started, the rain stopped and the sun came out from the blue sky. 


8. This contract is __ approval by both parties involved. 


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


10. Many young people today are [   ] with fashion and style. They care more about what they wear than what they think or believe.


11. A student's frequent absence from school is often a clear [   ] of his problem in life and study.


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


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


14. Anna has been asking Henry to eat more healthily but he hasn't been [   ] by her arguments.


15. The exterior of Tina's apartment has an exceptionally large [   ].


16. Mary can't hear, and she can hardly speak [   ].


17. It is often said that prevention is better than cure, so why not take some __ in advance? 


18. 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.  


19. The production of bread mainly includes the [   ] such as flour, sugar and eggs.


20. 《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.


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


22. 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.


23. [   ] you get from the website [   ] correct.


24. After being bitten by a [   ] snake, John was sent to a hospital.


25. The good weather and beautiful beaches make this island a great [   ] attraction.


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


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


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


29. My father and his partners’ cooperation is based upon their [   ] respect and understanding.


30. The children could not help but [   ] when the clown stepped on the stage.


31. All branch stores are required to fill out the ____ report to check if there is enough merchandise on shelf and in stock. 


32. Do you have [   ] for one thousand dollars?


33. [   ] at the back door, and they may hear you and open the door.


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


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


36. The government hopes that the charge for trash disposal can [   ] people from throwing away usable resources.


37. Tom’s colleagues threw a [   ] party for him the day before he officially retired. They wanted to show how much they would miss him.


38. [   ] I did not like her at first, she ended up becoming my best friend.


39. [   ] the doctor’s warning, he still worked overtime to earn a living.


40. Free Spirit Team will probably __ the speech contest as it is much better than our team. 


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


42. This child has been [   ] by his parents for a long time because they have been too busy working.


43. Today is a beautiful day, [   ]?


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


45. The [   ] earthquake has buried over 18,000 lives in southwestern China’s Sichuan province.


46. We are glad to receive your order for 50 units of classic furniture to be supplied to your own [   ].


47. The police arrested the suspect, but in the absence of [   ] he was set free soon.


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


49. When the orange trees [   ], there is a sweet fragrance in the air.


50. The window [   ] by my little brother yesterday.