---Did you notice someone enter the classroom just now?---Sorry, I didn’t. I _____ my lessons at that time.
Do you think _________ should be allowed to drive?
Swimming is good _____ our health, but at the same time we mustn’t forget the danger.
-I think teenagers should not be allowed to get car licenses. -I agree.They are not _______.
---I think students should be allowed ___ homework with friends. ---I disagree.They talk instead of ________ homework.
Health is very _____and every student knows the _____of keeping healthy.