---- It’s very important for everyone to exercise. do you exercise?----Three or four times a week.
He found _________ to sleep.
Lei Feng is my hero. We should learn from him and think less of____ than others.
My mother is ill. I ______ stay at home to take care of her.
--- Don’t be late next time. --- ______________.
Nanjing isn’t so large____ Shanghai. But it's the second____ city in East China.