Make a list of the things you want to buy before you go to the supermarkets. ______, you will certainly forget some of them.
I really don’t know ______ about it.
—What is a writing brush, do you know?—It’s used ______ writing and drawing.
We could see nothing because the lights suddenly ______.
The mountain was ______ steep ______ few people in our city reached the top.
The war was over about three months ago, ______ the American soldiers in Iraq are still having a lot of trouble to deal with.