Réponse:
1) If you want to improve yourself in english you have to make a lot of exercice but I don't recommend using an online translator.
2) I advise you to practice sport but I advise you not to use steroids to achieve your goal.
3) I'd advise you to tell them about it but I wouldn't advise you to call the cops for that.
4) You should wash this faster but don't use corrosive products.
5) I advise you to find yourself an activity in order to occupy your time and not to go to bed too late because it is possible that by finding an occupation it will take you too much time.