I have these holes in the concrete floor, and I want to install laminate floor. What can I do to fill in these holes to get a nice level surface.
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You don't need to fill pits of that size. The laminate floor will easily span that no problem.
Depending on the depth of the pits, you might be able to use sanded grout to get a nice smooth surface. Just be sure to let it dry and cure before laying down the flooring. You may need to apply it in multiple coats to get a perfect surface.
You could use epoxy concrete patch. Note your floor needs to be flat, meaning no bumps or ridges. It can be sloped in one direction consistently, but it has to be flat.