Vocabulary Check

quasar - aloof - congenially - combustion - acquiesce - motility

1. _____ emit an enormous amount of energy.
2. So as the crisis ebbed and the bank moved to embrace  retail finance, its grandees tried to appear a fraction more cuddly or less arrogantly _____.
3. Both men worked _____ and cooperatively, read the same books, located and shared information, talked incessantly about the possibility of manned flight.
4. They were to take advantage of the relatively tight internal _____ engine.
5. Further more, composers _____ to the demands of singers, writing many operas that were little more than a succession of brilliant tricks to the voice, designed to showcase the splendid vocal talent of the singers who had requested them.
6. They are fantastically diverse, but three major groups may be identified on the basis of their _____.