六．单词拼写（5分）

81. University professors often ___________ (抱怨) that students are handing in papers using false information they found on the Internet.

82.Having made good preparations, the students all made very wonderful ____________(陈述).

83．They considered themselves to be s_________to black people.

84. Lightning usually a__________ thunder.

85. The teacher did not explain its grammatical f_________.

86.Who can still have _________ (信任) in you despite your shortcomings?

87.They realized there was some __________ (潜在的) danger behind the case.

88.He tried to apply for the patent. But his a___________ was not accepted at all.

89. Her books enjoy a high p_________ among teenagers in many countries.

90.Their country is passing through__________(麻烦的) times. 

炉排面以上、排管以下的空间指的是（）的炉膛。

A、室燃炉

B、沸腾炉

C、半沸腾炉

D、层燃炉