Chọn đáp án đúng12. You should get a plumber ……………the pipes in your bathroom. A. to check B. check C. checking D. check 13. Ba is tired …………… he stayed up late watching TV . A. because B. as C. since D. A,B, and C are correct 14. The air in the city is very ............................ A. pollute B. pollution C. polluted D. pollutant 15. If the disaster................in an area, people from other areas will offer help. A. happens B. will happen C. happening D. would happen 17. I live in Da Lat, .............is one of the most beautiful cities of Vietnam. A. who B. which C. whom D. whose |