1.He was able to run 100 meters in 6 seconds when he was 20 years old.
2.She could read and write when she was at the age of 4
3.He lives on the outskirt and his house is far from his work so he always travels to work by a bus.
4.Farmers work very hard so they don`t have a real vacation.
5.Vietnamese students have fewer vacations than American students.
6.Yesterday,she went to school although she was tired.
7.He has to work 12 hours a day so he doesn`t have free time for his children.
8.They built this theater when I was at the age of 10 .
9.It takes her two years to finish her invention.
10.My younger sister always eats bread and drinks milk for breakfast so she is fat.
12.People started using computer 50 years ago.
13.Mai always stays up late to do her homework.
14.Who did you live with when you were small?
15.How long did they move their new apartment to city center?
16.Mai always spends two hours a week chatting to her friend on the Internet.
17.My brother has written for tuoi tre newspaper since he graduated from university.
18.Look!Mai is over there. She is same to her sister.
19.They might build a bridge accoss Nile river for 10 years
20.They sometimes take their children to the zoo on Sundays.
21.If it is sunny next week, we will plant vegetables in the garden behind the school.
22.We will save lot of trees if we don`t waste much paper.
23. If we reduce soil pollution, we will have enough food to eat.
24.If the level sea rises high, some countries will be able to disappear.
25.In the future, robots will be able to do many things like humans
