Viết lại câu sao cho nghĩa không đổi sử dụng từ gợi ý trong ngoặc:

9.Mert never smoked at all when he was at the University but now he smokers ten cigarette test today a day (use)

10.Pelé began his career at the age of 15 ( started )

11.hunting and farming were very important in human's lives. (played)

12.children didn't often play with high-tech devices at early age but now they do (didn't use to)

13.we don't export much wood this year. We exported more wood last year (than)

14.we needn't cook dinner because our family will have hot pot in some minutes (don't)

15.there were many tree-lined streets in my hometown but now there is none of them (be)