77. There are some potatoes in the fridge. (改为否定句)

76. Are the children reading English in the classroom? (肯定回答)

75. I can spend 20 _____________ (many) minutes in bed now.

74. Kitty is arriving on Sunday, the _____________ (five) of January.

73. The ______________ (story) are very interesting.

72. My uncle plans _____________ (study) in London next year.

71. _____________ (not stay) out too late, Wendy.

70. Now, the students ______________ (collect) stationery for the children from Wenchuan.

69. The boy never ____________ (lie). Believe him!

68. It’s midnight. Dad is ____________ (仍，还) working.

(B) 根据句意，用括号中所给词的正确形式填空。(7分)