[ Modal Verbs ]
. Dolphins ___ communicate through a series of clicks and whistles.
A. can
B. could
C. able to
D. must

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Modals in The Past › ViewThey ________________ (win) the football match, but John hurt his ankle.
A. could have win
B. could have won
C. should have winned
D. should have won
Conditional Sentences › View
If I _________________(not have) this terrible cold yesterday I ________________(do) my homework.
A. don’t have, will do
B. didn’t have, would do
C. hadn’t had, would have done