Misc: an adverb can modify a verb, an adjective, or ______?

Questions

At any given time, there are ---------- thunderstorms in progress over the earth's atmosphere.?

At room temperature, the average air molecule travels at the speed of a ---------- bullet.?

Bacteria, the tiniest free-living cells, are so small that a single drop of liquid contains as many as ---------- of them.?

---------- (the world's tallest grass) can grow up to 90 cm in a day.?

Bamboo (the world's tallest grass) can grow up to ---------- cm in a day.?