Our PE lessons are_____ Friday afternoon. [ ]

My father has a habit of jogging ________ the jinchuan River for an hour in the morning.[ ]

When the school building began to shake,the teachers ran downstairs _____ all the students. The teachers are real heroes. [ ]

It’s good for us young to do something___________. [ ]

I can’t tell when that house exactly, but it must be very long ago.