单词拼写。根据句意及所给单词首字母或汉语提示填空。

1. How many _________(科目)do you have at school?

2. My sister _____(上) maths every  day.

3. W_____ is the fourth day of the week.

4. I like English ,b_____it is intresting.

5. Our s___teacher is very strict in his work.

三棱柱底面边长都是3厘米，侧棱长为5厘米，则此三棱柱共有______个侧面，侧面展开图的面积为______平方厘米．