Most people are not yet aware that water is a precious resource that must be_________.
A. conserved
B. enriched
C. preserved
D. reserved
A:What are you looking for? B:I’m looking for a tool____.
A. and open the box
B. with that to open the box
C. and opening the box
D. to open the box
A:____would you like your coffee, black or white? B:White, please.
A. What
B. Which
C. How
D. How much
----I’ve passed the driving test! ----I’m glad to hear that you ____ it at last!
A. did
B. got
C. passed
D. made