根据句意和首字母提示完成单词。

1. The microwave oven can help you h        the food very quickly.

2. Can I borrow your pocket c        ?  This mathematical calculation is too difficult.

3. My favorite shoes are those with a        heels, because I can move the heels up and down.

4. This kind of machine can be o____easily, so you needn't much skill to do the job.

5. I need a pair of s       to wear at home.