________ I regret most is that I have promised to make friends with the dishonest girl.
A．How B．What
C．Where D．That
We can find out ________ all the excitement is about by playing QQ's “Happy Farm”．
A．that B．how
C．what D．when
I can't figure out ________ it is that makes him so difficult at school.
A． how B．what
C．why D．which
We all held the view ________ the book said was right.
A．that what B．what that
C．that D．all which
—How do you think I can make up with Jack?
—Set aside ________ you disagree and try to find what you have in common.
A．what B．where
C．whether D．which
So quickly are science and technology advancing ________ is a possibility today may be a reality tomorrow.
A．which B．what
C．that which D．that what
