Much to our relief，his disease turned out to be ________ than we had expected.

The professor spoke so fast during the lecture that we couldn’t _____ what he said.

When he fell off the bike, he tried ____ but couldn't .

Many years of hard work_______ his great success in the development of this new type of material.

We have got accustomed__________ in an air—conditioned room, so we can’t stand the terrible heat outside.