— There'ssomeone knocking on the door. Who _____it be?— It must be Mary. She promised to be here at 8:00.
Take your time—it's not________long distance from here to________ hotel you are going to.
—What qualities does a person need to become an astronaut? —He ________be knowledgeable,independent and creative.
Li Gang was required to apologize ________the people present at the meeting________what he had done.
—Have you heard that George quit his job? —Yeah, but I can't________why he did so.
—Tony, you must have noticed the student who broke the glass. —I'm sorry.I________attentively.