That is ______ key.

Mo Yan, ___ famous Chinese writer, became _____country’s first Nobel Literature Prize Laureate(诺贝尔文学奖).

What’s the matter ______ you ?—I have a bad cold.[ ]

Every Earth Day , We are made _____ signs to warn people to protect the nature .

There were not many people in the concert yesterday. —Pop music isn’t ________.