1)Try to convince them to work off a part of bill. f.ex. offer helping with cleaning the house every weekend.
2)agree with your brother one day when he can come to your room and after asking you for a cd and borrow it for a agreed frist.
3)Try to remind your parents that when they were in your age they also wanted to go for parties. Promise them that you won't get drunk as well as you won't do anything stupid.
4)ask your parents to take care of your friend's puppy for a week. if you'll pass this test, your parents won't have any doubts to buy you a puppy.
5)Try to send a letter to him/her or ask for a help your mutual friend.
1)You should stop eating junk food and go for a diet.
2)it get dark
3)has no idea what to do with his free time.
4)you spend a lot of time on learning
5)my parents let me go