Question

you want to place a piece of glass tubing into a rubber stopper after the tubing has been fire polished and cooled. this is best done by
lubricating the tubing with water or glycerin.
using a towel or cotton gloves for protection.
twisting the tubing and stopper carefully.
all of the above.
personal eyeglasses provide as much protection as *
a face shield
safety glasses
splash - proof chemical goggles
none of the above

Explanation:

When inserting glass tubing into a rubber stopper, lubricating (e.g., with water/glycerin) reduces friction. Protection (towel/gloves) prevents cuts. Twisting carefully ensures proper insertion. All these are standard lab procedures. For eye protection, personal eyeglasses don't equal face shields, safety glasses, or splash - proof goggles as they lack specific lab - grade protection features.

Answer:

For the first question: All of the above.
For the second question: None of the above.