1. I won’t be able to do everything myself if I don’t have a modern robot.

2. Tung's little sisters have seen "Tom and Jerry"for many times

3. The children enjoy staying on the farrm during the summer vacation.

4. Mr Tinh often goes to work on foot but now he is going by car

==============================

1. Yes, they are

2. There is too much smoke.

3. We are burning the forests, destrying lots of plants and animals.

4. No, they can't

5. The earth is danger now

6. We must save the Earth now

1. I won't be able to do everything myself unless I don't have a modern robot.

2. Tung's little sisters have seen "Tom and Jerry" many times

3. The children enjoy staying on a farm during summer vacation

4. Mr. Tinh often goes to work on foot but now he is going by car

VI

1. The seas and rivers are too dirty to swim in.

2. There is too much smoke in the air in many cities in the world. 

3. We are cutting down too many trees. We are burning the forests. We are also destroying lots of plants and animals. 

4. Farmers in many parts of the world can not grow enough to eat. 

5. The earth is in danger now.

6. Save the Earth right now!