$33.$ Thread cutting tools must be designed to accommodate both $\_\_\_$ and external threads.

$34.$ The diameter of a reamer is critical for achieving the desired $\_\_\_$ tolerance of a hole.

$35.$ Jigs primarily guide the $\_\_\_$ during machining, while fixtures hold the workpiece securely$.$

$36.$ Machining clamps must be designed to apply pressure $\_\_\_$ to prevent workpiece movement.