45. The glass doors have taken the place of the wooden ones at the entrance, ____ in the natural light during the day.

A. to let　　　　 B. letting　　　　　　 C. let　　　　　 D. having let

44. He is a student at Oxford University,__________ for a degree in computer science.

A. studied 　　　　　　　　　　　　　　　　　　　　 B. studying

C. to have studied　 　　　　　　　　　　　　　 D. to be studying

43. At the beginning of class, the noise of desks _________ could be heard outside the classroom..

A. opened and closed　　　　　　　　　　 B. to be opened and closed

C. being opened and closed　　　　　　　 D. to open and close

42. I smell something __________ in the kitchen. Can I call you back in a minute?

　 A. burning　　 B. burnt　　　　 C. being burnt　　　 D. to be burnt

41. -The last one __________________ pays the meal.

-Agreed!

　 A. arrived　　　 B. arrives　　　　 C. to arrive　　　　　 D. arriving

40. If we have illegal immigrants ________ in, many local workers will lose their jobs

A. came　　　　 　　B. coming　　　　　　　　 C. to come　　　　　　　　 D. having come

39. Throughout history, the language _____ by a powerful group spreads across a civilization

A. speaking　　　　　　 B. spoken　　　　　　　　 C. to speak　　　　　　 D. to be spoken

38. Due to the heavy rain and flooding ,ten million people have been forced ________their homes

A. leaving　　　　　　　　　 B. to leave　　　　　　 C. to be left　　　　　　 D. being left

37.As a new driver, I have to practice _________ the car in my small garage again and again

A. parking　　　　　　　 B. to park　　　　　　 C. parked　　　　　 D. park

36.I like getting up very early in summer. The morning air is so good 　　　.

A. to be breathed 　　　　　　　　　　　　　　　　　　　 B. to breathe

C. breathing　　　　　　　　　　　　　　　　　　　　　　　　 D. being breathed