Помоги очень срочно надо!!!! И почему мне нужно объяснять ответ !!! Спасибо заранее

3 1There are too many cars in the streets of big cities. 2 In some African countries kids don`t have enough textbooks. 3 There`s much pollution in industrial countries. 4 I haven`t got much homework to do this weekend. 5 Have you got enough money to buy the book? 4  1 Everybody must be here by 8 o`clock. 2 You mustn`t cross the street when the traffic light ghanges. 3 My dentist says I shouldn`t eat too many sweets. 4 You look tired, I think you should have a rest. 5 All exits must be kept clear in case of fire.