--- Middle school students hardly know anything about shopping online, ____ they? --- ________. It’s very popular with teenagers.
_____ warm idea came to me that I might use ______ pocket money to buy a gift for my mother on Mother’s Day.
The words _________ by Miss Li are marked ________ red.
Alice is famous ________ her paintings.
Mike is my good friend. He often helps _______ with my English.
We were worrying about you. You shouldn’t leave us_____ telling us.