1.bad worst (最高级) 2.become became (过去时)
3.fat thin (反义词) 4.sleep asleep(形容词)
5.angry angrier (比较级) 6.medicine cure(近义词)
7.hard difficult(同义词) 8.wake waken (动词)
9.one first (反身代词) 10.key keys(复数)
11.farther father(同音词) 12.lots of many(同义词组)
13.warm cold(反义词) 14.perhaps maybe(同义词
15.far most far (最高级) 16.we us(反身代词)
17.happy?(反身代词) 18.miss missing(形容词)
19.cry cried (过去时) 20.somebody nobody(反义词)