Final answer:
Unauthorized charges on your credit card and a missing passport are signs that your identity may have been stolen.
Step-by-step explanation:
One sign that your identity may have been stolen is unauthorized charges on your credit card. If you notice purchases on your credit card statement that you didn't make or authorize, it could be a sign that someone else has gained access to your financial information.
Another sign is when your passport is missing. Your passport is a valuable identification document, and if it goes missing, it could indicate that someone has taken it to assume your identity.
However, your favorite book going missing or your plants looking healthy are not signs of identity theft. While losing a possession or having healthy plants can be unrelated incidents, they are not indicators of someone stealing your identity.