Li Lei often goes to school _____ 7:10 in the morning. [ ]

Are Mr. and Mrs. Wang living alone in the house? —-Yes, altough they have three sons, of them live with their parents.

‘What can I do?’ I thought hard. Suddenly, a good idea went ______my mind.[ ]

Your mother isn’t a doctor, is she?—-___________. She teaches English in a middle school.

I left my keys in the room yesterday. I had to get in_____ the window.— It’s dangerous to do that.[ ]