The Science Museum , ________ we visited during a recent trip to Britain , is one of London’s tourist attraction.
——Don't forget to come to my birthday party tomorrow.——______.
What do you think ______ an apple ______ to the ground?
Why do you think ______ cut down the big tree?
—— ______ if I smoked? ——I'm sorry, but it's not allowed.
Do you think his tie is _________?