--- Middle school students hardly know anything about shopping online, ____ they? --- ________. It’s very popular with teenagers.

— She has gone abroad，______?—No. She is still teaching us English at our school now.

—Mary, could you tell me if your mother ________ our school sports meeting tomorrow?　　—I think she will come to school if she _________ free.　　

There will be a new park in the center of the city, ______?

– Millions of people know about Susan Boyle now, __________? -- _________, she becomes well-known because of her success on Britain’s Got Talent.