He’s still not understood by his close friend although he has said sorry to him, _________?
| A．hasn’t he | B．has he |
| C．isn’t he | D．is he |
.You ____ be tired—you’ve already been working for three hours without having a rest.
| A．must | B．mustn’t | C．can’t | D．may not |
— Do you come to South Korea for the ________ of seeing your family or doing business?— I come here on business.
| A．interest | B．benefit | C．purpose | D．thought |
With the help of his friends, he changed a lot. Maybe that’s the ____ of friendship.
| A．station | B．energy | C．decision | D．invention |
—What can we do to________ bird flu from spreading?
—Try not to buy or eat chickens that have not been checked.
A. preventB. cause C. discover
We can buy all kinds of books in this bookstore________ they’re good and cheap.
| A．although | B．as | C．but | D．or |