—May I go swimming this afternoon? — I'm afraid not _______ you have finished your homework.
It’s half past eleven. It’s time ________ have lunch. A. to A. of C. at
It’s difficult for _______ to draw the pictures,______ are too young. (小)
---Thank you very much. ----__________.
This pair of socks ______ black and white.
I can see three _______ in the two ______.