--_____ you call back tomorrow? --Of course I can. 

－Who’s that girl swimming in the pool? Is it Lucy?－It        be Lucy. She is sleeping in her bedroom now.

—Listen! Peter is singing in the classroom! —It _____ be him. He has gone back to his hometown.

--Shall I take my swimming suit ?--No , you _____ . We will just go hiking in the mountain . 

_____ you tell me how to use this digital dictionary?

— Is Mr. Smith driving here?  —I’m not sure. He ______ come by subway.

 —________I complete so much my homework now?— No, you ________.You can do it after supper.

You _______ cross the road when the traffic lights are red.

— ______ you sing the English song?— Yes, I can. But only a little.

— Must we send our plan this week?— No, you ______.

 —Tom can’t find his gloves. Are these blue gloves his?      —No, they ______ be his. His gloves are black. 

— Dad, must we wait until the light becomes green? — Yes, I’m afraid we ______. That’s the traffic rule.

Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.

 —Who’s that boy reading in the study ? Is it David?—It __________ be David. I saw him go home just now.

—Mum,       I watch TV now ? —No, you        finish your homework first.

--- ______ I bring you all the magazines right now?--- No, you don’t have to, but you ______ give them to me tomorrow.

－Must I make the writing plan now? － No, you______. You______ finish it tomorrow.

--Listen! Tom is singing in the next room.--It _______ be Tom. He has gone to Shanghai. 

 Don’t put off today’s work till tomorrow. I mean, today’s work _____today.

---Never touch my computer while I’m away． --- Sorry,  __________.