--______ class is Betty ______?--Class Five.
— Hurry up! We’ll be late for the plane.— Don’t worry. The plane won’t_______ until two hours later.
—Mum, can I go to the zoo with Jack this weekend? —When your homework_______, you can.
—Have you decided _______ to Xi’an? —Yes. I’ll go there by train. It’s much cheaper than by plane.
— Do you have any plan for this summer vacation, Mary?— Sure, I’ d like to be a volunteer and help to ______ the Central Park.
I don’t want to make friends with those people ______ think of themselves first when in trouble.