----How do you deal with disagreements between the company and the customers?----They key____ the problem is to meet the demand ___by the customers.
----Dad, please open the door, it ______. ----OK, dear. I am coming.
This kind of sweater______very soft.
----Have all the students known that our class will visit the factory this afternoon? ----Yes. Every student______about it.
The cake ______delicious.
My father has given up smoking since he ______on.