That’s ______ the party called on us to do.
A. what
B. why
C. how
D. that
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He asked ______ for the violin .
A. did I pay how much
B. I paid how much
C. how much did I paid
D. how much I paid
As the day was fine, I made the suggestion ________ for a walk in the park.
A. we go
B. we will go
C. should we go
D. that we go
______ the boy didn't take medicine made his mother angry.
A. What
B. That
C. How
D. Which
It's uncertain ______ the experiment is worth doing.
A. if
B. that
C. whether
D. how