Press 0 (that's zero on the numeric pad) in a combination with left, right, up or down to use the sword.
To get the 'shaver' you need to go in the hole and up those weird stairs in the back (then just a little to the right - you won't see Jerry at that point).
The bomber is tricky, you need to have quick reflexes to fly it and you drop light-bulbs with 0.
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