I enjoy ________ visitors around.
—What has happened in your hometown? — Great changes _____ in my hometown recently.
—_____ 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
—They have been to Australia. —So _____ I.
—Our school is beautiful! —It will be more beautiful if more trees and grass _____ by us. A. plant B. is planted C. are planted
—I have worked hard at math, but it seems that I haven’t made any progress. —Keep on _____ at it, and you will be successful. A. work B. working C. to work