How much water is there in the bucket?

How much water is there in the bucket?
A.Nothing B.None
C.No D.No one
Before class,I was nervous____my duty report.
A.in B.to C.about D.of
I love to watch the monkeys ____the tree.
A.climbing B.climbed C.to climb D.have climb
I didn't pass the math exam last term.（同义句）
I ____the math exan last term.