I ______ my sister ______ the host of the party.
It is ________ my old camera, so I have just bought a new one.[ ]
Will you stay at home until your sister comes back? —Sorry, I _______. I have a meeting and have to go in ten minutes.
What do you think of the report on the UFO? Great! Many students were interested in it and they kept on standing _____ the end of the meeting. [ ]
I wonder when they ___ for Beijing. I will go to the train station to see them off whenthey ______.