—What qualities does a person need to become an astronaut?
—He ________be knowledgeable，independent and creative.
A．can B．may
C．would D．should
Li Gang was required to apologize ________the people present at the meeting________what he had done.
A．for；by B．with；about
C．to；for D．at；with
—Have you heard that George quit his job?
—Yeah, but I can't________why he did so.
A．put out B．figure out
C．carry out D．send out
—Tony, you must have noticed the student who broke the glass.
—I'm sorry.I________attentively.
A．studied B．was studying
C．am studying D．would study
—Sorry for the delay.I got lost in the mountain.
—That's OK.You're safe and that's what________.
A．does B．works
C．stays D．counts
—Tom has been fired by his boss.
—________？As far as I know，he is a hardworking and considerate fellow.
A．Why not B．How come
C．What then D．So what
