— Susan, would you like to go hiking with us this afternoon?— I'd love to, but I study for a test.A. may B. have to C. can
---________ we clean the classroom at once?---No, you________. You ________clean it after school
---Listen! Kate is singing in the classroom.----It_____be Kate. She has gone to the Library.
—Sorry, I just come here. Ask the old woman, she _______ know something about it.—Thank you all the same.
---Could you please come to the museum with me this afternoon?---Sorry, I ______ . I have to take a piano lesson at 2 pm.
--- Lin Tao, can I use your English dictionary?--- Sure. But you _______ return it before the class.