1】 --I really don't know ____A____

1】 --I really don't know ____A____
---Don't worry .i will do___help you.
A to do；what I can do
B doing ；what i can
C to do；what i can
D doing；that I can to do
2】I heard_B__that my aunt would come back from Australia.
A a good news B a piece of good news
C a good piece of news D good news