They went out for a walk at night, _______ ?
—Is it interesting to play computer games?—Yes, _____ you are interested in playing computer games, you’ll have trouble giving it up.
She has _____ this car for nearly ten years.
—Where are Maria and Kangkang?—They _____ England.
—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; wasC.How many is; was D.How many was; is