1. Singapore is famous for its …………. and green trees. A.cleanliness B.cleanly C.clean D.cleaning 2. …………… water is one of the factors that have driven many species to the verge of extinction. A.Contamination B.Contaminate C.Contaminated D.Contaminating 3. Too much carbon dioxide in the atmosphere causes global ……………. warm warmly warmth warming 4. When we were on holiday, we spend too .......... money. much many a lot lots of 5. If people work so much, they .......... depressed and eat more. may have felt may feel felt have felt 6. I spend .............my spare time gardening. the most of most of the most of most 7. .................cups of coffee have you taken? How many How much How How long 8. If children don’t play sports, they .............. sleepy and tired. would feel had felt feel will feel 9. We couldn’t buy anything because ............... of the shops were open. all none half most 10. They could understand our conversation if they ......... some English. knew know known knows