Yes, I'd agree with Carol, Bgirl.
Very nice start, and you write Clark's emotional anguish well. As she suggests, you can beef up Lois's sense of despair too.
I noticed the tense switches as well - fanfic should normally be written in the past tense, and in any case you shouldn't switch tenses. So convert those present-tense sentences - there are some in both sections - to past tense and you'll be fine.
This is a good start, but it's somewhat short.
You'll notice that most people post about five or six times that amount, so that's what we're used to here.
Give us more next time, and you'll get more comments.
Congratulations on starting your first fic!
Wendy