Fill in the blanks with the most appropriate option:-

Romi is not ……… good that he cannot be defeated.

so

The correct option to fill in the blank is so.

The sentence is about Romi's skill level. The word "so" is used to indicate that Romi is very good, but not perfect. He is not so good that he cannot be defeated.

The other options are not as appropriate:

• Too is used to indicate that Romi is too good to be defeated. This is not what the sentence is trying to say.
• As is used to compare Romi's skill level to someone else's. This is not what the sentence is trying to say.
• Very is used to emphasize Romi's skill level. This is not what the sentence is trying to say.