—Ben and Sue aren’t home,are they?
—No.They _____to London on business.
| A．have gone | B．go | C．have been | D．will go |
I really don’t know ______ about it.
| A．what to do | B．how to do | C．to do what | D．how can I do |
—What is a writing brush, do you know?
—It’s used ______ writing and drawing.
| A．with | B．to | C．for | D．by |
We could see nothing because the lights suddenly ______.
| A．went on | B．went over | C．went down | D．went out |
The mountain was ______ steep ______ few people in our city reached the top.
| A．so; as | B．so; that | C．as; as | D．too; to |
The war was over about three months ago, ______ the American soldiers in Iraq are still having a lot of trouble to deal with.
| A．or | B．and | C．but | D．so |