Complex Sentences, Linking Use of Colon and Transition Words

I got an excellent mark in the test ____ I studied hard for it.

Plenty of resources will be wasted _____ people are not conscious of their usage.

Where to place the colon in: "The director told his employees 'Everyone will receive a hefty bonus.'"

Where to place the colon in: Can you buy me these ingredients onion, garlic, chicken, and sesame oil?

Use of colon in: The pet I really wanted to have: a Husky.

Use of colon in: 'The government employees rallied for three reasons: better salary pay, better insurance coverage, and additional paid leaves.'

Transition word for "addition":

Transition word for: '_____, he came after waiting for him for two long hours.'

The boys in the club wore green shirts; ____, the girls wore red ones.

Transition word for sequence?