__ It is so late. Our son __________ be back .
__ Don’t  worry . I dare say he ________ have some extra work to do.

Robert Collier once said, “A single idea---the sudden flash of a thought
--- __________be worth a million dollars.”

．—I did not know you were good friends．
—You___．I have known her since she moved here．You were abroad then．

—I’m surprised more and more people________participate in the morning exercises in the plaza now.
—Morning is a time of day.

Never _______ forget the days when ______ together with you.

．--- I’m sorry. I should not have been so rude to you.
--- You____-- something not very nice to me, but that’s OK.

---I’m afraid I ______ return the book to you before Friday.
--- Take your time.

Tom, turn down the music. Why    you make such a big noise while your baby sister is sleeping? 

He ________ get into his own house because he has lost his keys.

No wonder you caught a cold. You________have gone out last night without a coat.