Add punctuation: Room for 4 persons
A: Room for 4 persons.

Add punctuation: Another allergic reaction is the one to bee stings
A: Another allergic reaction is the one to bee stings.

Add punctuation: Brillouin was a physics assistant at the Collge de France while he worked for his doctorate in mathematics and physics which was awarded in 1881
A:
Brillouin was a physics assistant at the College de France while he worked for his doctorate in mathematics and physics which was awarded in 1881.