—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
All of us are ____ at the ______ result.
We must try _____ people _____ the animals in danger.
--Mary,would you like to visit the Science Museum with me? ---_______,but surfing the net seems more interesting.
---I feel tired and sleepy. ---Why not stop_____?
She jumps _____of us four.