Bonjour voilà pour le premier exercice:
quit — stop
cut down on — reduce
keep doing — continue
try harder in/at —give more efforts in/at
start — begin
et pour le deuxième exercice:
1) I’ve decide to quit my job cause it’s annoying.
2) I am going to cut down on playing video games.
3) I think that I am going to keep playing football this year.
4) I am going to try harder in cooking.
5) I am starting a new lesson about cow.