Choose the correct word to complete each sentence.
When someone has a ________ illness, you should take it seriously and get help right away.
If you don’t treat your cold, it could get ________, and you might feel even more sick
It is ________ to see a white tiger in the wild because they are very hard to find.
A ________ is a disease that spreads to many people over a large area, like the flu or COVID-19.
A ________ helps protect you from getting sick by making your body stronger against certain diseases.
Cases of the flu are ________ in some countries during the winter season.
When you have a ________, your body temperature is higher than normal, often because of an infection.
