1.If you spend less time on computer games and television programs, you wil have more time for outdoor activities.                    wil have  => will have

2.I think 10 years from now more people have enjoyed going to work by bicycle.             have enjoyed => will enjoy

3.He has collected so much books for poor children so far.                much => many

4.Recently this organization encourages people to recycle rubbish such as cans and paper.                  encourages  => has encouraged

5.You should watch fewer TV because looking at screens for a long time hurts your eyes.             fewer => less

6.The Japanese eat a lot of fish and healthy food, but they live for a long time.                        but => so

7.We should follow the advice from doctor and health experts in order to keep fit.                 doctor  => doctors