— How about buying Sam a mobile phone? After all, he isn’t a boy any more. —I think it necessary, for we sometimes want to make sure if he _______ home for dinner.
—Mary’s been offered a job in a university,but she doesn’t want to take it. —________? It’s a very good chance.
—I’m sorry I made a mistake! —________.Nobody is perfect.
It’s much easier to make friends ________ you have similar interests.
You must learn to consult your feelings and your reason________you reach any decision.
In the global economy,a new drug for cancer,________ it is discovered,will create many economic possibilities around the world.