49. --- I am going to the United States.

--- How long ______ you ______ there?

48. My brother works for a company __________ makes mobile phones.

47. How much does the trip ___________ you? 　---3,000 yuan in all.

46. I ___________(正要) to go to bed when there was a ring.

45. The house, __________ windows face my garden, caught fire last night.

44. Please help me ____________(查一下) when the train to Shanghai leaves

43. You will be late ___________ you go right now.

42. The little girl has _______________ (经历了)a lot of hardship since their parents died.

41. There are so many _____________(名胜) in London that you can hardly see all of them just in one vacation.

40. ---Where did you __________(学会) your English?

　 ---When I stayed in London.