Sam is doing some about the ancient Silk Road.( )
A.exerciseB.operations
C.researchD.experiments
---May I do the rest of the work tomorrow? ---Yes, of course. You finish it today.
---May we go home mow ? --- No, you____. You____ to go home until 5 o’clock.
Tom ______ come with us together, but he is not very sure yet.
—Whose magazine is this? —It Ben’s. It has his name on it.
— Remember: you _______ keep it secret and leave it closed. — No problem.