—Listen! Someone is singing in the next room. Who ____ it be? Is it Li Wei?—No, it ______ be her. She is at school now.
-Do you know how many counties_______ during his journey to Europe last month?-Quite a few. He was warmly welcomed by the countries' leaders.
-A number of college students_______ to work in China's rural (农村的) areas.-Yes, we call them "college-graduate village officials". Their number is getting_______.They brought new ideas to the less-developed villages.
-Mike wants to know if_______ a picnic tomorrow. -Yes. But if it_______, we'll visit the museum instead.
Our country is_______ 56 nations and_______ of them can be tom away from the motherland.
-Do you know that Armstrong got his flying license in his_______, even before he could drive a car! -That's amazing. He is a_______ pilot.