Tìm lỗi sai

tìm lỗi sai 
1- it isn't hard taking up a hobby.
2- sit too close to the TV harm your eyes.
3- children do more exercise than adults, but they are more active.
4- my mum wants to keep fit, so she plays tennis two times a week.
5- we will travel to a mountains around Viet Nam in the future.
6- you shouldn't to go out after 10pm in the park alone.
7- then, you pour the mixture in to a bowl.
8- eating too much junk food in isn't good for for your healthy.
9- students like join different clubs at school.
10- there aren't some bananas left form lunch.
11- which time do your classed finish ?
12- our tink we have few vacations than America pupils.