1. 1) are made, 2) was discovered, 3) arrived, 4) don't use, 5) is covered, 6) is going, 7) are spoken, 8) do you know, 9) was written, 10) are cleaned.
2. 1) younger, 2) the most exciting, 3) the best, 4) much, 5) more comfortable, 6) faster, 7) older, 8) the most helpful, 9) big, 10) long, 11) richest, 12) less.
3. 1) John drives dangerously.
2) Sue studies hard.
3) Jane is a very fast runner.
4) Liz is a good cook.
5) Roger writes amazingly.
6) Kate is a very good singer.
7) Rick tells stories terribly.
8) Jenny is an early bird.