Question

I am unwell, ____ I won't able to go school today.​

Answer 1

I am unwell, so I won't be able to go school today.

Here, We are required to add a coordinating conjunction in the blank.

So suits well because The later sentence is a consequence of the first sentence, in other words, The first sentence is the reason for occurring of second sentence. Hence, We use $\boxed{so}$.

More useful information : Because is used in the middle of the two sentences, when the second sentence is the reason for occurring of first.

Answer 2

Answer:

✨ I am unwell, so I won't able to go school today.

Additional information:

✨ "So" is a suitable conjunction.

Also this answer to above blank can be.

✨ I am unwell, so that I won't able to go school today.