Simple Present

The outboard wheel half ________________a convenient location of the valve stem used to inflate and deflate tubeless tires.

• provide

• provides

• providing

The metal ________so hot it __________.

• get/welds

• gets/weld

• gets/welds

Brinelling—caused by excessive impact. It __________as indentations in the bearing cup raceways.

• appears

• appear

• appearing

The surface metal is destroyed as the motion ___________and ______________

the metal apart in the direction of motion.

• continue/pulls

• continue/pull

• continues/pulls

The high-speed metal to metal contact of the bearing rollers with the race ___________heat that damages the metal surfaces.

• causes

• cause

An aircraft tire _____________a tendency to adhere to the wheel.

• has

• haves

• halves

It ____________as a reddish/brown discoloration.

• appears

• appear

• appearing

The bearing cup _________________ removal for inspection

• don´t require

• doesn´t require

• doesn´t require

• don´t requires

Hard landings ______________distortion or cracks that are very difficult to detect.

• produce

• produces

Modern aircraft typically ___________disc brakes.

• uses

• use