Ответ:

  1. Nicky is thinking of giving up her job. OK
  2. Do you believe in God?
  3. I feel hungry. Is there anything to eat?
  4. This sauce is great. It tastes really good.
  5. I think this is your key. Am I right?

Глаголы believe, feel, taste и think в этих значениях обычно обозначают состояния, поэтому употребляются в Present Simple.