根据句意和汉语注释，写出单词的正确形式。

1.As we know, oil always __________ (漂浮) on water.

2.He __________ (点头) to me in greeting when I entered the room.

3.We are very __________ (自豪) that a pupil from our school has won the prize.

4.They all hurried __________ (往楼上) to see what was going on.

5.There was __________ (沉默) for a moment and then someone made a useful suggestion.

A) 根据句意及所给中文提示或英文解释，写出句中所缺单词。

1. Going hiking is an ______▲______(very good) chance for students to learn team spirit.

2. I write to my mother every week, ___▲__(主要) on Sundays.

3.We are very _____▲___ (自豪) that a pupil from our school has won the prize.

4. They all hurried ____▲___ (往楼上) to see what was going on.

5.Students should pay a____▲____ to what the teacher says in class.

6. We all believe a friend in need is a friend ____▲_____(真正的).

7.This car is so expensive that I can’t ____▲___(买得起) it.

B) 根据句意或句子的语法要求，用括号中所给单词的适当形式填空。

8. A year ___▲________(group) into 12 months .

9.His father died because of   ▲   (ill)

10. Only the team’s finishing time will be __▲____( record).

11. The doctors in the hospital are trying a new ____▲___ (treat) for cancer.

12. We will show the _______▲_____(visit)around our school.

13.It is necessary for you _____▲_____(support) and help each other.

14.I think it is _____▲____(mean) to help the poor live more happily.

15.The _____▲____(interview) has prepared a list of questions.