________ not to miss the flight at 15：20, the manager set out for the airport in a hurry [ ]

By the time I locked the door, I realized I ______my keys at home.

Hi, what did our monitor say just now?— Every boy and every girl as well as teachers who are to visit Water Cube ______ asked to be at school gate before 6∶30 tomorrow morning.

I think it unwise to live ______ one’s income, as is the case with a lot of young people today, who often turn to their parents for help

The Science Museum, ________ we visited during a recent trip to Britain, is one of London’s tourist attractions.