It is requested that visitors ________ photos in the museum.

___________the vegetables, we began to dig the ground.[ ]

Shall we go to Alberta for the summer holiday—_________. It’s one of the world’s cleanest cities.

Were you at home at 9:00 pm yesterday— Yes, I for a call from Paris at that time.

It’s impolite to _____ your parents. You should talk to them politely.