Translation of "Supposing" in Japanese

What would happen supposing the earth stopped spinning?

地球の自転が止まったら、いったいどうなるんだろう。

Supposing war broke out, what would you do?

もし戦争が起こったら君はどうするか。

Supposing it rains tomorrow, will you still go on a picnic?

明日雨が降ってもそれでもピクニックに行きますか。

Supposing you had one million yen, what would you do with it?

１００万円持っているとしたらどうしますか。

- What would happen supposing the earth stopped spinning?
- What would happen if the earth stopped turning?

地球の自転が止まったら、いったいどうなるんだろう。

- Suppose you are fired, what will you do first?
- Supposing you are fired, what will you do first?

もし首になったら、最初に何をしますか。