We'll have a class meeting ________ 3:30 this afternoon.
in
on
at
— Remember: you _______ keep it secret and leave it closed. — No problem.
(2014)—How nice that Lucy has been invited to the party too! —Well, Lucy not come. She is not certain whether her mother will allow her to.
--- Lin Tao, can I use your English dictionary? --- Sure. But you _______ return it before the class.
--What are you going to do tonight, Cindy? --I’m not sure. I __________go to see a movie with my friends.
—Mum, may I draw some flowers on the wall? —Oh, no, dear, you _______. Why not draw your beautiful flowers on the paper?