useless trivia: What Word Means: Scarce?

Questions

Fleas can accelerate ------------- times faster than the space shuttle.?

Half of all murders are committed with ------------?

The population of the entire world in 5000 B.C., according to the National Population Council, was ---------------?

zzzOf the 15,000-odd known species of orchids in the world, 3,000 of them can be found in ---------?

On a bingo card of 90 numbers, there are approximately -------------- ways to make B-I-N-G-O.?