回答

4) ① fear → fearful ※be fearful of ~ing ~することを恐れている
② △waiting → being kept waiting ※keep 人 waiting 人を待たせる → 人 be kept waiting 人が待たされる<受動態>
⇒ The reason why I don't want to go to the dentist is not that I'm fearful of having my tooth pulled out but that I dislike being kept waiting for a long time.
【別解答】
I don't want to go to the dentist not because I'm afraid of having my tooth pulled out, but because I don't want to be kept waiting for a long time.

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