[ Vocabulary and Grammar ]
what is the past participle of the word “ring”
A. rung
B. rang
C. ringed
D. ring
Select your answer:

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Expressing Obligation and Modals › ViewComplete the sentences with the correct form of the modals and verbs in parentheses:
We ___________ (must / maintain) excellence in our customer service or people will complain.
A. mustn’t maintain
B. must maintain
C. must maintains
Modals of Deduction › View
I heard a loud noise outside. It ___ be a thunderstorm.
A. must
B. can’t
C. might
D. will
