Help me a great favor?

Q1.
This place is different form the supermarket we're used to isn't it, Al? 最尾 Al 係人名, 例如： Al Gore, Al Pacino, Al Capone.

Q2.
There isn't much of a section? 加個 a ,不加 on 或 the，因為 "isn't much of" 描寫着 "整個" section。而且 "isn't much of a" 是個 common saying，meaning " it isn't an impressive ..... "。意思說這是一個沒有很多東西的 section。

Q3.
The prices are low only on selected items. 這句子又要用 on 因為 price 後面的 preposition 文法上要用 on。

Q4.
Long long ago 是很難答的，因為歌和詩在文法上沒有文章那麽嚴緊，所以很難去改正所有歌詞的文法而不失去歌詞的意義或聲韻。我會去試試。

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祝您好運!

Q1: "Al" is the short form of the name that this person was talking to. "Al" usually refers as "Albert".
Q2: "There isn't much of a section" is grammatically correct. It would be wrong if you use "on" or "the". Remember gramma is a "law". You can't argue with "law", but to follow the way it is.
Q3: Again, "on" is correct gramma. Don't waste time to argue gramma. Just follow the way it is.
Q4: Resend your question. I will answer if I'm still around.