She had just finished her homework ______ her mother asked her to practise playing the piano yesterday.
——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 _________?