Take note of the clues in the sentence to help you arrive at your answer. For example, in question 4, the answer is "shivering" as it is an action done when someone is feeling cold. "Feeling cold" is an important clue here! :)

As for questions 4 and 5, the phrasal verbs "look into" and "illustrator" need to be learnt as vocabulary. Check out their meanings in a dictionary to learn from it! :)