Bài 1: Viết lại câu sao cho nghĩa không đổi 1, People in richer countries live longer because they have better diets and healthcare ⇔ ...... because of .... 2, The reason people use coal and oil less and less is to reduce pollution ⇔ Because greatly change.......... 3, There's less disease thanks to great changes in people's eating habits ⇔ People greatly change ....., so.... 4, Having a higher birth rate than death rate can cause overpopulation ⇔ ............. than birth rate can cause overpopulation 5, Good diets and healthcare help increase life expectancy ⇔ With the help of .........., people .......... 6, We have several ways of producing energy without destroying the environment ⇔ There .......... 7, Let's build more green schools in Viet Nam ⇔ We should ......... 8, Why don't we ask for advice on saving energy ⇔ We ........