A) can
B) must
C) could
D) might
E) should

A) might
B) could
C) should
D) can
E) must

A) work
B) be
C) sing
D) go
E) do

A) listen
B) walk
C) go
D) work
E) play

A) study all night
B) a balanced diet
C) exercise all the days
D) relax at home
E) sleep all the day

A) the better
B) goodest
C) gooder
D) more good
E) better

A) worse
B) the worst
C) the worse
D) the badder
E) the baddest

A) are going to be
B) be going
C) will be
D) going to
E) will

A) progressive
B) past
C) past perfect
D) present perfect
E) present

A) adverbs
B) verbs
C) nouns
D) prepositions
E) adjectives