—Congratulations! Among the best pictures in the competition，I found _______. Why did you draw it?一During the trip to the Yellow Mountain _______ May.

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

—Can I tell Peter about the news?—No, I don’t want anyone else to know it. You _______keep it to yourself.

“No student,” the headteacher stressed, “_______ go out of the school after ten o’clock at night without my permission.”

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