Answer: By the time they came, we had finished our dinner.
Came is past tense, so I would assume it would be had finished
She asked what I was doing when I knocked at the door.
hatter, gossip, prattle, prate, babble, blather, blether, blither, maunder, gabble, jabber, tittle-tattle; slabber; chitchat, jaw, gas, gab, yak, yackety-yak, yabber, yatter; natter, rabbit, witter, chunter, waffle, chinwag; waddle, clack
Answer:
travel resources (ex. trucks, planes, etc) and money, obviously (for repairs and supplies for resources and stuff, etc)