用括号内所给动词的正确形式填空。

1. Walking after meals _______(be) good for your health.

2. How can I sleep well when you _______(chat) so loudly?

3. Mr White works as a teacher now, but he _______(work) in a company for several years.

4. She was allowed _______(not pay) so much money for this blouse.

5. The vegetables don't taste very good. They _______(cook) for too long.