81. His father’s ________________(die) made his family full of sadness.

80. He spent as much time as he could ________________ (improve) his math.

79. Our teacher often tells us the ________________(important) of learn English.

78. As students, we should c________________ more on our studies than on anything else.

77. When we say “He failed the exam.”, we mean that “He didn’t s______________ in passing

the exam.”

76. It is n_______________ for young children to sleep ten hours a night.

75. She got an o__________________ to volunteer in a local hospital last year, but she didn’t go

because she had to go back to school.

74. I don’t think he can a________________ such an expensive car.

73. Studying abroad alone is a big c________________ for teenagers.

从方框中选择适当的句子完成下面的对话，并将其番号填入题前的括号内。

A: How time flies! __________________ (67)

B: I agree with you. What are you going to do during the winter holiday?

A: I’ve no idea. ________________ (68)

B: I heard from my grandma last week. She wants me to spend the summer holiday with her.

A: Where does she live?

B: In a small village between two hills. It’s about 12 hours by train from here.

A: ________________ (69)

B: Perhaps. ______________(70)

A: Oh? Why?

B: I’m weak in math, you know. ________________ (71) I hope I will be able to catch up

with you next term.

A: _______________ (72) Have a good holiday!

B: Thanks. The same to you!