—Is that your mother?—No, she is my __________, my cousin’s mother.

-Tom, do you know David Smith?-Sure. He is my best friend and our __________ has lasted for years.

— I have ______ in learning chemistry. Could you help me with it?— Sure, I’d love to.

---- Do you know how to prevent the A/H1N1 flu?---- You can ask the doctor for some ________.

If you study hard , I’m sure you’ll get good ________.