—A shy boy like John ________ give up a secure job and start his own business!
—Yes，nobody had expected that.

—Tom often drives carelessly.
—Tell him he ________ answer for it if he goes on behaving like that.

— Who has done that again?
— _______ you ask? Little Tom, of course!

—Who______ it be that is knocking at the door?     —It ______ be Father, but I’m not sure.

--- You didn’t tell your parents the date of our graduation ceremony, did you?
--- No, but I ____. My sister had told them.

“I am astonished, my dear,” said Mrs. Bennet, “that you _____ be so ready to think your own children silly.”

—What qualities does a person need to become an astronaut?
—He ________be knowledgeable，independent and creative.

(2013·高考陕西卷)The children________lost in the woods；otherwise，they would have been at the lakeside camp as scheduled.

(2013·高考江西卷)When I was a child，I________watch TV whenever I wanted to.

(2013·高考安徽卷)It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.