Select the correct word a/an or some Mind countable and uncountable

Select the correct word a/an or some
Mind countable and uncountable nouns.
1. I have ______ good idea.
2. That's _______ interesting job!
3. They have found ______gold in that old mine.
4. Do the Smiths have______yellow van?
5. Look! He's having_____water.
6. He always likes________piece of chocolate.
7. I have_________homework to do for tomorrow.
8. There's ________nice girl in the red car.
9. Would you like______milk with your cookies?
10. How about _______grapes?