I think it unwise to live ______ one’s income, as is the case with a lot of young people today, who often turn to their parents for help.

I’m badly in need ______ your help.

He has been        the computer for two hours, chatting with a boy from Australia.

The accident that happened at an oilfield____ the southeast coast of the U．S．A has caused great damage to the environment.

Although _______ my opinion,the old professor didn’t come up with his own.