The number of giant panda is because people always hunt them.
_______ the one-child policy, our country has controlled the population successfully. A. Thanks to B. Thanks for C. As for
Everyone should save every drop of water. Remember to _______the tap after you finish washing.A. turn off B. turn down C. turn on
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