1. We have been waiting for Jack for almost two hours. I wonder [   ].


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


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


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


5. The joke you told me really [   ].


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


7. Climbing unemployment rates and dropping job opportunities are huge __ to the new government. 


8. The controversial singer must [   ] 100 hours of community service for altering the age on his ID card.


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


10. You should always [   ] your opinions politely.


11. A: [   ] B:He’s a salesman.


12. The new medicine is still in [   ] stages and will not hit the market until next year.


13. It seemed that the walls    . 


14. In this course, the economic background of labor legislation will not be mentioned, [   ] be dealt with.


15. This coffee shop is famous because it sells numerous varieties of coffee beans [   ] from around the world.


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


17. [   ], I didn’t like Susie, but then I found she was a nice girl. Now we’re good friends.


18. The     plan of the company provides income security for their employees after retirement. 


19. I might have the chance to visit the theater [   ] person.


20. Let’s __ jump to the conclusion, okay? 


21. My brother's [   ] is to become a doctor; but he'll need to study hard to get into medical school.


22. If you [   ] that HBO movie last night, you wouldn’t be so drowsy now.


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


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


25. 《Nicole》: Do you have any plans for tomorrow, Alison? 《Alison》: [   ]《Nicole》: Let’s go shopping!


26. 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.  


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


28. The economy is in bad shape, one reason for which is the rising [   ] rate.


29. A: Why did you feed that kitty? B:There is nothing [   ] a homeless cat.


30. The [   ] from the top of Mt. Kilimanjaro is amazing.


31. Many journalists do not ____ whether or not it is appropriate to interview a child during a tragic event for he/she is usually too young to understand the trauma he/she is involved in. 


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


33. I think thunder is scary, [   ] lightning is beautiful.


34. Old soldiers never die; they only [   ].


35. My twin sister’s values have [   ] so much over the years that we are no longer compatible.


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


37. The parrot used its strong [   ] to crack open the nuts.


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


39. The town [   ] great changes since I was here last time.


40. If you [   ] my children, what subjects [   ] you teach them?


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


42. Professor Lin does [   ] not late assignments. Students have to hand them in on time.


43. I saw Mary a week ago. She said she [   ] me the next day, but she didn’t.


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


45. Tina’s legs were black and blue and she had several burn marks on the arms. She may have been [   ].


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


47. We [   ] tell John about the accident, shouldn’t we?


48. 《Lin》: You look so angry. What happened? 《Chen》:This morning I took my car to the garage to have them check the air-conditioner. They only gave it a once-over, refilled it with some Freon, and charged me 3,000 dollars! 《Lin》: No wonder you’re livid. [   ]


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


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