I think that it would be that you're not covering the holes with your finger correctly, or that, as said before that your horn be broke. maybe you've accidently bent one of the keys so it does not seal properly, if your having trouble playing middle B and C on the staff the key that is probably playing up would be your C key or key No 3.
trying to get diagram of C key on my profile...
Most likely, there is something wrong with the clarinet. Go to your local music and arts or some other music store (or if you're in a band ask your director to take a look at it) and have them take a look at it. Check all the springs, make sure none of them are popped out of place (if it is, all you have to do is pop it back into place- i had a spring out of place a few weeks ago and a few notes sounded way out of tune so my director fixed it in no time). also, look for any loose screws, if there's a loose one, find a small screwdriver and tighten the screw (just make sure you don't tighten it too much or it could mess up the clarinet). same goes for if there is a screw too tight, just loosen it a little, but not too much. If that doesn't fix your problem then it is definatly opperator error- it may possibly be the fingerings you're using or your ombisure may be too tight.
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