----How do you deal with disagreements between the company and the customers? ----They key the problem is to meet the demand by the customers.
It was______ back home after the experiment.
______ I have made great progress in my spoken English, I can not express myself freely.
It is _____ he often fails in exams _____ makes his parents worried about him.
Waves of red light are about twice as long as _______ of blue light.
Eventually, the husband could no longer ______ his wife’s complaints about his inability to make much money, and he divorced her.