Question

only a fool can challenge him (begin: none___)

Answer 1

Answer:

None other than a fool can challenge him.

Explanation:

The given sentence contains minimal typing errors so let's first correct it,

Only a fool can challenge him. (Begin: None............)

We must begin the sentence with the word i.e. "None".

We must make sure that whatever group of words we add after " None", the sentence altogether must be meaningful as well as grammatically correct.

The sentence beginning with "None" and has the meaning as the given sentence is below,

None other than a fool can challenge him.

Answer 2

Answer:

None but a fool can challenge him.