.Use the correct variant of the verb:
1.The city ( was founding/ was founded/ found ) in the 7th century.

2.Look! It ( rain/ was raining/ is raining ) heavily outside.

3.I( didn't saw/ didn't see/didn't seen ) him yesterday.


4. This school ( open/ will open/ will be opened) by the end of this month.


5.They ( returned/ were returned/ had returned) home before the rain (stopped/stopped/ was stopped).​