Our city is becoming nicer. Look! There are many trees and flowers on _______ sides of the streets.
A. all B. each C. both
We used to study in the old building_______ was broken down last year.
A. which B. where C. what
—How long _______it _______ you to work out such a difficult problem?
—About thirty minutes.
A. did… take B. does… take C. did…cost
Excuse me, sir. Could you tell me _______?
A. where can I get a post card
B. where I can get a post card
C. that I could get a post card
My hobby is changing all the time. Now I am _______ in collecting coins. It’s_______ and valuable.
A. interesting; interested B. interested; interesting C. interested; interest