UnScramble this Word: u a r l g a s d?

Questions

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.?

There are 170,000,000,000,000,000,000,000,000 ways to play the ten opening moves in a game of------?

There are 6,272,640 square inches in an --------?

There are 63,360 inches in a ------?