根据句意及首字母（或汉语）提示完成单词

1. Jiang Lei is a g           from Peking University.

2.Teachers are s           to know a lot and care for the students.

3. I put the letter into the e           and then had it mailed.

4. I will tell you a piece of d           news that we didn't get the first prize.

5. After he made a mistake, Jim got very           (紧张的) .

6. Some students from poor v           in China often don't have enough money for college education.

7. We had seven subjects this s           .

8. Scott is a h           student. He always studies hard.

9. I'm sorry to           (打扰）you. Can you lend me your pen?

10. The students didn't have classes last night. They stayed in the           (宿舍).

砂浆立方体抗压强度试件养护期间，试件彼此间隔不小于（）mm。

A.15

B.20

C.25

D.10