Don't come into the office_ you are allowed A. if B. when C. until
Without friendship, one won’t be happy _____ he is very rich.
Bob,_______ your coat. It’s cold and windy outside.
---- Don’t worry. I will help you. -----Thank you. It’s very kind ______ you to say so.
–Jim passed the Chinese exam. What about Jack? -- .
I am too busy now. If I____ free, I ____to the cinema with you.