----How do you deal with disagreements between the company and the customers?----They key____ the problem is to meet the demand ___by the customers.
Take a taxi , _____ you'll miss your train .
If you _____ stop smoking , you can only expect to have a bad cough .
There must be _____ book which could help .
Sarah hopes to become a friend of _____ shares her interests.
The young man spent as much time as he _____ over his lessons.