_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it．
A. Desertification; are working B. Desertified ; worked
C. Desert; work D. Desertification; have worked
I don’t like the way ___________ he talked to his mother.
A. that B. which C. in that D. what
I’m sorry, but I didn’t see how we can get all this work you assigned_______ by next Tuesday.
A. having done B. done C. being done D. to do
She left the city, ________ never to return.
A. determined B. to determine C. determining D. having determined
The film is well worth _________.
A. seeing B. to see C. of seeing D. seen
It should not be a question of humans_________ and nature ____________.
A.win; losing B. winning; lost C. win, lost D. winning, losing
