forerunners
forefathers
foremen
formers
第1题:
heard
hearing
hears
hear
第2题:
第3题:
How
What
Which
Who
第4题:
none
either
neither
both
第5题:
第6题:
take off
take on
take up
take in
第7题:
exemplified
exterminated
littered
erased
第8题:
patient
positive
negative
peaceful
第9题:
obscure
attractive
appropriate
evident
第10题: