—I am trying my best to learn English, but it doesn’t work well!
—Don’t worry! Regard it _____ a big challenge!

The art club is for members only. You can’t go in ____ you are a member.

Without friendship, one won’t be happy _____ he is very rich.

.My sister still wants to go to school ____she is ill.

Study hard,_______ you will not pass the exam.

In the end he entered his ideal school_________ his hard work．

The war was over about three months ago, ______ the American soldiers in Iraq are still having a lot of trouble to deal with.

Tom is a true friend, _____ I didn’t like him at the _____.

The little girl is very young _____she can take  care  of  herself  well.

Mr.Smith has been here for many years,     he has few friends.