1. It was (good) driving I have ever seen.

    better than

    the best

    as good as

2. Peter sang (loud) than all the others.

    the loudliest

    louder

    loudlier

3. The holiday wasn't (expensive as the one we had last year.

    more expensive

    as expensive

    the most expensive

4. She's a good student. She works (careful) than the others.

    more carefully

    more careful

    the most careful

5. Would you play (quiet) please? I'm trying to sleep.

    quieter

    more quietly

    the most quietly