―Do you know where David is? I couldn’t find him anywhere.―Well. He ______ have gone far — his coat’s still here.

 — Do you know where Mary is? I couldn’t find her anywhere. — Well . She        have gone far—her coat’s still here.

 --- I saw the Smiths at West Beijing Station this afternoon.--- You __________. They are still on holiday in Hawaii.

—Has Mr.Tom White arrived ? ---- Yes ,already .  ______he wait outside or just come in ?

 — I promise Shirley ______ get a new iPad on her birthday. — Will it be a big surprise to her? 

 It __be the vocabulary that caused you the problem in the exercise because you know a lot of words.

--Why are your eyes so red? You _______ have slept well last night.

 – Excuse me, sir. But nobody _____ smoke here in the lift! -- Sorry! I didn’t see the sign. 

When we were in the college, we       stay in the library, devoting ourselves to books.

----- I’m sorry . I ________ at you the other day .  ----- Forget it. I was also a bit out of control of myself.

A survey has shown that 40% of those killed in traffic accidents _____ if they had been wearing seat belts.

He ______be lazy, but he can work hard when he feels like it．

—What do you think of Peter?—He ______ be really difficult to get along with even though he’s a nice person in general.

------I can’t wait to go to your party. ________ my friend Susan come?------ Of course. She is always welcome.

The motorbike _____ start, no matter how hard he tried.

—Shall I inform him of the change of the schedule right now?—I am afraid you ________, in case he comes late for the meeting.

 —Why are you late again?—Something happened to our friend Wang Fei. I _____ to help him.

—What do you need to say?—No person         smoke or carry a lighted cigarette in this special room.

She is a quiet girl at school，but sometimes she _____ be very naughty.

---There’s someone knocking on the door. Who _________ it be?---It must be John. He promised to be here at 8:00.