4. 1) warmer
2) hottest
3) oldest
4) taller
5) colder
5. 1) the heaviest
2) the coldest
3) is faster
4) is happier
5) is older
6. 1) Mike is older than Alan
2) Laura is heavier than Sophie
3) Alan is taller than Sophie
4) Sophie is older than Alan
5) Laura is the oldest child
6) Mike is the heaviest child
7) Laura is the tallest child