He was speaking so fast（）we could hardly follow him.

单项选择题Before __________for the job, you will be required to take a language test .

单项选择题Please call me back__________you see this message.

单项选择题As the price of oil keeps__________,people have to pay more for driving a car.

单项选择题Only when we hurried to the airport__________the flight was canceled.

单项选择题John had never been abroad before, __________he found the business trip very exciting.