--- Catherine, I have cleaned the room for you. ---Thanks.You _______ it.I could manage it myself.
Follow the directions on the bottle carefully when _______.
Do you think ______ important _______ us to learn a foreign language?
-----I think it _______ to smoke . ------ _______.
______ to collage this year, We must study harder than ever before .
Don’t have the clock ______ , Your father is sleeping.