. Knowledge of English is a must in international trade.
My father and his teacher talked a lot about the things and persons ___ they could remember.
About ________ of the workers in that steel factory_______ young people.
What an important part the Internet_______ in our life! One can hardly imagine____ life would be like without it.
When the woman found her borrowed valuable necklace (项链) ______, she felt______ the world was at an end.
______ he has made a decision, it is not easy for you to make him change his mind.