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Here are a pair of sentences.
In (A), gerund is used as a subject and in (B), perparatory pronoun "it" is.
They are all grammatically alright or sound natural?
If not, please let me know the reason.
Thank you.

(A) Climbing a mountain without a backpack is easy enough

(B) It is easy enough climbing a mountain without a backpack.

(A) Saving money is important.

(B) It is important saving money.

(A) Going out this evening is out of question.

(B) It is out of question going out this evening.

(A) Using a mobile phone while driving is illegal.

(B) It is illegal using a mobile phone while driving.

Eating raw fish is common in country-region w:st="on" style="">.

It is common eating raw fish in country-region w:st="on" style="">.
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Hi myid,

All of the B answer should have the infinitive, not the gerund, to sound natural.

It is easy enough to climb, it is important to save, it is illegal to use, it is common to eat.
Comments  
Grammar GeekHi myid,

All of the B answer should have the infinitive, not the gerund, to sound natural.

It is easy enough to climb, it is important to save, it is illegal to use, it is common to eat.

Thank you very much for your help.