It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson

What should we do to fight A/H1N1 flu—We should wash hands often, avoid ______to crowded places and so on.

You are saying that everyone should be equal, and this is ______ I disagree with you

下列各句中，没有语病的一句是( ）

The biggest flower show in our city will be open to us all next Saturday.–_________ news! I’m glad that we can take a trip there on weekend.