Here are the correct forms of the given words for each sentence:

5. The light **went** out while we **were having** dinner.
6. While we **were crossing** the street, we **met** our teacher.
7. Tom **saw** an accident while he **was standing** at the bus stop.
8. The children **were playing** football when their mother **came** back home.
9. The bell **rang** while Tom **was taking** a bath.
10. We **cleaned** the house when she **came** yesterday.