The main clause is "Chris's chief interest was tennis".
The subordinate clause is "Which he was just learning to play" and it is an adjective clause because it describes what the "tennis" was like. Tennis is an object and this subordinate clause further describes that it is the tennis that he was trying to learn.
I think such as, because you are naming multiple symptoms. You are not comparing/contrasting, consequently is used in a sentence to state something as a result or therefore. Initially means at first, when used in a sentence. So, “such as” is the best choice.
<span>To listen responsibly means to like really understand what is being said. It is listening without any extra thoughts. This is when a person takes not of the details in order to get what is being told by the speaker.</span>
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