=>
1. I want to be fitter and healthier, so I eat more fruit and vegetables.
-> so : vì vậy, vậy nên
2. You don't wear a sun hat, so you have a sunburn.
-> so : vì vậy, vậy nên
3. Be careful with what you eat and drink or you may have an allergy.
-> or : hoặc, nếu không
4. Tom has a temperature and a sore throat.
-> and : và
5. You don't wash your hands very often, so you are catching flu.
-> so : vì vậy, vậy nên