Although they plant trees in this area every year, the tops of some hills are still_【CET-4真题】
A. blank
B. hollow
C. vacant
D. bare
Some people would like to do shopping on Sundays since they expect to pick up wonderful_____ in the market.【CET-4真题
A. Batteries
B. bargains
C. baskets
D. barrels
The professor could hardly find sufficient grounds_his arguments in favor of the new theory.【CET-4真题】
A. on which to base
B. which to base on
C. to base on
D. to be based on
Many people think of desert as_________regions,but numerous species of plants and animals have adapted to life there.
A. void
B. virgin
C. barren
D. wretched