小题1:wonderful/nice/beautiful/ unforgettable…
小题2:helps/encourages…
小题3:ill/ down
小题4:took(good) care of/looked after/stayed with…
小题5:Best wishes! Wish you success in the future/happiness/health all the time!
试题解析：本文大意：是时候说再见了，是时候回忆我们一起度过的难忘的日子了。你一直是那个当我需要时帮助我的人。当我生病（摔倒时）是你背着我去医院。祝你永远幸福、健康。
小题1:考查形容词。句意：是时候回忆我们一起度过的难忘的日子了。wonderful/nice/beautiful/ unforgettabl美好的、难忘的；形容词修饰名词；根据recall回忆，we spend together我们一起度过的，可知填wonderful/nice/beautiful/ unforgettable…
小题2:考查动词。句意：你一直是那个当我需要时帮助我的人。help/encourage帮助、鼓励；who引导定语从句，me前用动词；根据 when necessary当需要时，可知填 helps/encourages…
小题3:考查动词。句意：当我生病（摔倒时）。fall ill生病，fall down摔倒，固定短语；根据it was you who carried me on your back to the hospital.是你背着我去医院，可知填ill/ down
小题4:考查动词。句意：你照顾（陪）我。take care of /look after照顾，stay with和……在一起；根据 while I was having an injection当我在注射时，可知需要照顾，故填took(good) care of/looked after/stayed with…
小题5:考查交际用语。句意：祝你永远幸福、健康。Best wishes! 最好的祝愿，Wish you success in the future祝你永远成功（开心、健康）/happiness/health all the time；写信结尾时要表达最好的祝愿，可知填Best wishes! Wish you success in the future/happiness/health all the time!