6.Mark's put on 5 kilos since he quit smoking.
7.Joana doesn't eat much because she doesn't want to be overweight.
8.You should/ had better/ ought to do exercise regurlarly.
VII.
1.healthily
2.sickness
3.vegetarian
4.Obesity
5.allergic
6.sunburnt
7.tiredness
8.headache
VIII.
1.laptop's->laptop
2.eat->eating
3.How's->What's
4.obesity->obese
5.fruit->fruits
6.a->an
7.more->less
8.but->so