... car before he got his promotion. 13. At this time next month, they (work) .................. in Ho Chi Minh City. 14. The house is much smaller than we (think) .................. at first. 15. ... used and enjoyed. In the past, most people believed up. Today, we know that this is not true. An important part of ( 31) .................. is the prevention of waste – waste of forests, soil, ... is smoke from factory chimneys harmful to our environment? 38. What does “this” in ( However, it is not possible to do this) mean? 39. What do car exhaust fumes contain? 40. What sources cause...