Which of the following words can NOT be added the prefix "un_______" to give it the opposite meaning？（ ）
A．happyB．healthyC．usualD．polite
Have you ever heard of Cao Wenxuan，a writer from Jiangsu？
Of course．______，he is a good friend of my father's．（ ）
A．I meanB．That is to say
C．Above allD．Believe it or not
My mind wasn't on what he was saying so I'm afraid I _____half of it．（ ）
A．missedB．was missing
C．will missD．would miss
I can't find the magazine I bought this morning．
Well，Jack is reading _____over there．Why not go and see if it is yours？（ ）
A．itB．thatC．oneD．some
Although he was _____my opinion，the old professor didn't come up with his own．（ ）
A．againstB．onC．forD．in
Father's Day is coming，Shall we make a card for Dad？
Good idea！But would you show me _____ because I only know little about DIY？（ ）
A．whyB．whenC．howD．where