Please assist in some phrase proof-reading

I've been trying to learn Japanese text reading, and now I'm trying to advance myself with some really basic Japanese writing. I've tried to write these phrases from English to Japanese but have a hard time predicting the grammar and text structure. Please bare all the beginner's mistake

1. Why did you sing so suddenly?
どうしていきなり歌うんでした?

2. Hey, let's make some cake?
ね, ケーキを作ってみましょうか?

3. Like Adam and Eve.
アダムとイブのような

4. All the available magazine in the rack.
ラック上のすべての雑誌

Can anyone help me in correcting all the mistakes? Thank you very much for your time.

1)
どうしていきなり歌ったんです（か）？

3)
As an attributibe clause, yes. It's アダムとイブのように, when used adverbially.
e.g.
life like Adam and Eve
アダムとイブのような暮らし

to live like Adam and Eve
アダムとイブのように暮らす

4)
I would say ラック上にあるすべての使える/買える雑誌 or ラック上の使える/買える雑誌すべて.

Toritoribe;726088 said:

1)
どうしていきなり歌ったんです（か）？
3)
As an attributive clause, yes. It's アダムとイブのように, when used adverbially.
e.g.
life like Adam and Eve
アダムとイブのような暮らし
to live like Adam and Eve
アダムとイブのように暮らす
4)
I would say ラック上にあるすべての使える/買える雑誌 or ラック上の使える/買える雑誌すべて.

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oh ok, I understand thank you very much Toritoribe! I'll study harder from now on.