When the teacher found some of his students getting nervous at the examination, he told them to ____

(2017·天津)—I want to see Mr. White. We have an appointment.—I’m sorry, but he is not ___________ at the moment, for the meeting hasn’t ended.

________ fails to realize the importance of improvingthe learning strategies will have great difficulty in learning.

_________ expensive mobile phone it is!—Yes, but I think _________ style is quitefashionable,

Is this your pen—— _________. It’s her pen.