—Look, John‘s fallen asleep at work!
—Oh, he must have ________ late last night.

--Look! John is ___. Let’s go and see if he needs any help.

A, out of the breath   B. out of breath   C. out of his breath  D. out of breathes

—Look, John’s fallen asleep.

— Oh, he _______ too late last night.

A. might sit up     B. should have sat up      C. could sit up           D. must have sat up

—Look, John‘s fallen asleep at work!

—Oh, he must have ________ late last night.

A．waken up         B．put up            C．taken up          D．stayed up

 —Look, John’s fallen asleep.

— Oh, he _______ too late last night.

A. might sit up     B. should have sat up      C. could sit up       D. must have sat up