18. About one thousand people live in this village, _____ earn their living by fishing. (A) which (B) most of that (C) most of whom (D) most of them

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