4. Fill in the correct form of the word.

The answers are: 1) hottest, 2) cheapest, 3) highest, 4) best, 5) cleverest, 6) most difficult, 7) most dangerous, 8) heaviest, 9) oldest, 10) most expensive, 11) fattest, 12) best, 13) most popular, 14) coldest, 15) biggest, 16) best.