All ___ glitters is not gold.
A. what
B. that
C. those
D. which
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The only thing ___ really matters to the children is how soon they can return to their aunt and uncle's farm.
A. what
B. that
C. which
D. of which
___ were known as "barefoot doctors" were not barefooted.
A. Those
B. What
C. Which
D. Of which
___ one of the two boys wants to try.
A. Each
B. Every
C. No
D. Some
I've invited ___ of my colleagues in turn.
A. every
B. none
C. no one
D. each
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