The cost is an expensive habit? not really sure but people who smoke spend a lot of money if they have been smoking for a long time.
The sentence that has an adjective clause is the third one - <span>Liz, who could always make people laugh, was loved by the whole block.
Here, the adjective clause is <em>who could always make people laugh, </em>because it describes the subject, <em>Liz.
</em><em />The other sentences have only adverb clauses.
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The answer will be someone sent you flowers.
