Explanation:

- Option 1: imply - This means to suggest something indirectly without stating it outright. It doesn't fit well here because the statement is direct advice.

- Option 2: intend - This implies having a purpose or plan in mind. It doesn't fit because it doesn't convey advice or recommendation.

- Option 3: claim - This means to assert something as a fact. It isn't suitable here as the context is about advising action, not stating a fact.

- Option 4: suggest - This means to offer advice or a recommendation, which fits perfectly here as you're recommending buying tickets in advance.