He was so busy ____ his homework that he forgot to have supper.
––Would you like to watch the movies with me tonight? ––_______, but I have too much housework to do.
––How much does the ticket ______ from Yinchuan to Beijing? ––310 yuan.
––Don’t ask the foreigners that question. It’s too______. ––Sorry, I won’t next time.
The ______ at this time is very busy. There are too many cars on the road.
I hear that Tom will be back _______ a month.