– I won’t go to the party tonight.–______ you told me you would. What’s the matter?

　　　　 it rained heavily this morning, nobody in our class missed the lesson.

We can’t go out for a walk _______ the bad weather.

—What’s the matter with you? You look so worried.-- I don’t know ___________ the problem.

You don’t know how difficult the job is,           you have done it yourself.