[ Passive Voice and Modals ]
Nests _________________________ by birds.
A. are building
B. are builded
C. are built
D. is built
Select your answer:

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Grammar › ViewAll cars ________________ pass a test once a year.
A. can’t
B. must
C. don’t have to
Modals of Obligation › View
Complete the sentence with the correct option.
He _________take the exam. It’s optional.
A. don´t have to
B. doesn’t have to
C. mustn’t
