找出下列句子的病因，并改正。

1. I saw the blackboard carefully (认真地).

2. He gets up at six everyday.

3. I walk to home after school.

4. Could you buy a bike to me?

5. We went to Beijing. We shoped there.

下列行为没有问题的是（　　）

A．吃了刚从集市买回来的草莓

B．吃了发芽的马铃薯

C．定期清洁厨房与炊具

D．用腐败变质的食物喂家畜