—Did you meet with the famous space hero , Yang Liwei ?— I had come here earlier !
The work calls for great care and patience, so you ______ to do it.
______ he is doing an operation on a patient; please don’t disturb him.
There has to ______ a well-developed system that can give people a warning when a tsunami is ______ the way.
—I hear Johnson ______ in the middle school. —What? I can’t imagine him ______ as a teacher.
He has passed the examination _____ his hard work.