A group of noisy children ( ) the bus, and ran for the school building. A: tumbled out of B: tumbled about C: tumbled along D: tumbled around

The dog had _______ down the cliff. A: tumbled B: tumbles C: tumble

They ______ to escape from theprison, but failed. A: bended B: tumbled C: swiped D: attempted

He impatiently ______ through the pages of files without any intention of making decisions. A: tumbled B: tossed C: flapped D: flipped

This type of system which ______in the United Kingdom has been widely used throughout Europe and is gaining in popularity in the United States of America and Japan. A: rebounded B: tumbled C: originated D: deposited