Smoking is not allowed in our school, so it may be a good chance for our math teacher to_______ smoking.
— I hear your pen friend is visiting Suzhou at present. Is it the ______ time for her? — Yes, and she will come for a fourth time next summer.
Oh, dear. Remember ______ your toys with Helen. She is your best friend.
Do you know Paris is the capital of _______?
The boy is only four years old, but he can swim ______ the lake.
Look at the beautiful shirt. _______ colour is _______ favourite.