I think he must be writing his essay at home now, ______?
Hangzhou is __________beautiful city,and it is worth__________.
The boy is old enough to __________the difference ________right and wrong.
He fell in love__________Mary and asked her to marry__________him.
We laugh at jokes, but seldom __________about how they work.
—Chris, how about going to a seafood restaurant? —! I told you I don't like the smell of fish.