Human facial expressions differ from those of animals in the degree __________ they can be controlled on purpose.

Thelanguage used in advertisements differs from ____ used in ordinary readings.

There goes the bell.—It’s time for class. Let’s stop .

Thousands of foreigners were _________ tothe Shanghai World Expo the day it opened.

Why not join us in the game, Joe? —________, but I have to finish reading thebook first.