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ok, not bad for lip syncing. for an animation though. this was a test which in my opinion needed to be blammed.
Here are some lip sync tips, I noticed that the lips moved towrds the right a bit, that is a big yet common mistake. You want a guide to better you chances of it staying in the spot without the shift.
Second, it was a little choppy. I suggest you increase the framerate and put a little more time and deail into the lips.
Third, did you tween anything? This question shouldnt be brought up. You never want to tween the mouths in such a low framerate. it looks unprofecional. BUT, in some cases you can get away with a little tweening, As long as it looks smooth and flows well.
Last, never use the same lip sequence twice, i noticed at the end you repeated a few frames, that is not a good thing, It can be the most important part to an animation so you cant get lazy on it.
I hope you found this review helpful. This was a posotive review, i gave it a 1 simplly cause i just dont belive in test animations. I want the real thing.