There’s ____ in the book, so no one is interested in it.
-- Thank you for giving me so much help! -- ________ A. It’s a pleasure. B. It doesn’t matter. C. It’s fun.
The air pollution is serious, ________ we must try our best to reduce it. A. so B. or C. if
--The river used to be clean. How does it become dirty? -- There are many factories ________ waste water into it. A. pouring B. pour C. poured
-- ________ Why don’t you clean your room? -- Sorry, I’ll do it right away. A. Take it easy. B. What a mess! C. Don’t worry.
Turn down your radio. Too much noise does great harm________ your ears. A. for B. on C. to