I’m most awfully grateful to you. I can’t think what I ________ without you.

—-I’m very sorry. I haven’t brought you the pen you lent me yesterday.—-Forget it. You      not return it to me as I have got an extra one.

— I can’t find my dictionary anywhere.— You _____ have lost it while studying in the library.

---Look at these tracks. It _____ be a wolf.”  ---Don’t be so sure. I think it _____ be a fox.

He demanded ___ here in time.

If you ___require any further information, please do not hesitate to contact us.

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

You ______be sitting in this waiting room, sir. You see, it is for women and children only.

The weather ________ be very cold at times, though it’s usually warm in spring in my home-town.

Despite the fact that his scores were good, they were hardly as excellent as a student with his intelligence          .

He did not regret saying what he did but felt that he _________ it differently. 

The boy         the first prize, but he was so careless as to make a foolish mistake.

———It was a green dinner. _______ ———Thanks. But it really only took an hour.

It is often recommended that children ________chances to get close to nature.

I really don’t know how to express my thanks to Mr. Li, my high school English teacher, without whose help I__________ to college that year.

If you were to do it,the result______different. 

It was playing computer games that cost the boy plenty of time that he ______ spent doing his lessons.

"They didn’t take measures in time, otherwise the explosions ____．"some experts said．

—You ought to have made an apology to Tom yesterday evening．—Yes, I know I __       __．

Why is so silent in the room? He _________asleep in the room.