Puzzle 1

A half-year term in a school or university

Tripped - over words or feet

Unexpected drop in winter temperatures

Chemical sphere to protect clothing from insects

Codename of Windows XP operating system

Play by George Bernard Shaw: Man and __

Desert in Southern Africa

__ in disguise, means a bad thing turns out good

The science of creating cocktails

Happy, in a good mood

Wrongdoings, illegal acts