—_____ the population of the U.S.A. in 2005? —It _____ about 296 million. A. What is; is B. What was; was C. How many is; was D. How many was; is
—Not only the young but also the old are getting interested _____ WeChat (微信). —They can communicate more freely.
____of the land in that district____ covered with trees and grass.
—Must I go to medical school and be a doctor like you, dad? —No, you _______,son. You’re free to make your own decision.
Liu Ying is good at singing. She sings ______the famous singer, CoCo.
This is the school _______ I studied three years ago.