... every)19. Air pollution………… almost every major city in the world. (that affects, it affects, affects, which affects)20. Unless we…………… throwing garbage into the river, it will be polluted. ... to work.[ ] c. if not you go to work. CONDITIONAL SENTENCE TYPE 1• In the if clause of a Conditional Sentence Type I, we use • In the main clause of a Conditional Sentence Type I, we use I. ... level (rise) if the planet (get) hotter. CONDITIONAL SENTENCE TYPE 2• In the if clause of a Conditional Sentence Type II, we use • In the main clause of a Conditional Sentence Type II, we use...