—Is the dentist at work?—I'm sorry to tell you he is on __________.
—Our women athletes achieved great success in the Vancouver Winter Olympic Games. —Yes.No one could perform________,I think.
—Did you have a good night’s sleep,sir? —Oh,exactly.It was such a comfortable bed.I could never have________sleep.
I have a lot of readings________before the end of this term.
Our teacher advised you to________the article that is too long so as to make it fit the space.
I was just talking to my old friend when Mary________.