4. The singer refused to answer all the personal questions. He did not allow anyone to invade his ______. (A) surgery (B) atmosphere (C) privacy (D) challenge

10. The dirty air, known as smog, is a combination of weather conditions, fumes and smoke from cars and factories and therefore is sure to ______ many serious health problems. (A) bring up (B) give rise to (C) look forward to (D) have little to do with