[3-15] I'm using DO to do some iteration, but it doesn't terminate.

Your code probably looks something like
   (do ((sublist list (cdr list))
        ..)
       ((endp sublist)
        ..)
     ..)
or maybe
   (do ((index start (+ start 2))
        ..)
       ((= index end)
        ..)
     ..)

The problem is caused by the (cdr list) and the (+ start 2) in the
first line. You're using the original list and start index instead of
the working sublist or index. Change them to (cdr sublist) and 
(+ index 2) and your code should start working.

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