The basketball ________ I bought yesterday cost me 80 yuan.
— What are you up to? — ____.
— It’s half past six now. — ____! We have only twenty minutes to get there.
There are lots of mistakes in my homework because I didn’t pay attention to ____ the teacher.
Bill was ____ tired after a whole day’s work.
You ____ swim here. It is said that sharks (鲨鱼) have been seen.