41.                 (Do/Does) Li Ming like sweet food?

42. --- Is Mr. Chen in?--- No, he has                 (gone/been) to work.

43.                 ( Are, Will) you                 (buy, bought) a new knife tomorrow?

44. Tomorrow I will                 ( use, used) my computer to send an e-mail to my penfriend.

45. The boy has                 (fallen ill/been ill) for half a month.

46. Each of us                 (has/have) an English-Chinese dictionary.

47. My grandparents have                 (got married/been married) for 50 years.

48. She usually                 (does/is doing) her homework after supper.

49. He                 (arrives/arrived) in London yesterday morning.

50. Jim has                 (catch a cold/have a cold); he doesn't feel well today.