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 ​