Question

the following footwear is best in the laboratory. *
sandals.
open - toed shoes.
close - toed shoes.
shoes appropriate for the weather
horseplay or practical jokes in the laboratory are *
always against the rules
ok
not dangerous
okay if you are working along

Explanation:

In a laboratory, close - toed shoes are best as they protect the feet from spills, falling objects, etc. Horseplay or practical jokes are always against laboratory rules as they can cause accidents, damage equipment, or endanger lives.

Answer:

For the footwear question: close - toed shoes.
For the horseplay question: always against the rules.