In order to protect the environment，people are greatly encouraged to travel by public________.

There were restrictions _____ the weight of luggage. As a result we decided to travel _____.

Sam was hired by the hospital to _____ the elevator. [ ]

do you think of the idea, Jack — ______ ! I can’t expect a better one.

What’s the price of iphone4S these days–It is much ____. You may go and buy one.