单项选择题We hope you will see your way (clear) to ( ) your price.
单项选择题Everybody in the class must give in () exercise book within the given time.
单项选择题The law requires all cars () for safety and efficiency.
单项选择题The weight of something is another way of describing the amount of force exerted on () by gravity.
单项选择题Prior () his departure, he wrote a letter to his mother.