—Middle school students don’t know much about shopping online,______they?—__________ . It’s very popular with teenagers .A. do,No,they don’tB. do,Yes,they doC. don’t,No,they don’t
I didn’t go to bed ______ I finished all the homework last night.
Simon always feels sure about his own ability, he is so ______
The lights in the classroom are on, but ______ is in it.
JSTV station will cover ______ the women’s football match tomorrow.
—Sir, would you mind my sitting next to you? —__________. My father will sit here in a minute.