A tyre _____ when you pump air into it, it shrinks when the air is gone. A: committed B: favored C: switched D: transmitted

In conversational English "is not" often ______ to "isn't", consequently, "was not" to "wasn't", "are not" to "aren't". A: shrinks B: compresses C: condenses D: contracts

When world economy is cold, world trade volume will shrink, at the same time the commodity price fells down, so the value of world trade shrinks more.