Has Sam finished his report?—I have no idea. He _______ it in his office the whole morning.
Where is my bag? I can’t find it.—Don’t worry. It must bein your room.
The young man is ________ to carry the heavy box.
Must I stay here with you?— No, you . You may go home, but you go to the net bar (网吧).
Did you finish your homework ______?— Yes, nobody helped me. [ ]