QUES: then you dont like all insects the Gnat went on as quietly as if nothing had happened

correct the punctuation.

CORRECTED: ' -- then you don't like all insects?' the Gnat went on, as quietly as if nothing had happened.

QUES: Upon this she became a member of the teaching staff at Wiley College in Marshall Texas between 1942 and 1945

correct the punctuation.

CORRECTED: Upon this she became a member of the teaching staff at Wiley College, in Marshall, Texas, between 1942 and 1945.

QUES: If you visit the MS Maritime Museum of Denmark on the same day you get 20 discount on the ticket price by showing the ticket from MS Maritime Museum of Denmark

correct the punctuation.

CORRECTED:
If you visit the M/S Maritime Museum of Denmark on the same day, you get 20% discount on the ticket price by showing the ticket from M/S Maritime Museum of Denmark