[ Modal Verbs ]
Choose the correct modal verb to express necessity in the following sentence: Students _______ complete their homework before the end of the day.
A. can
B. must
C. should
D. might
Select your answer:

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Verb Patterns › ViewDid your remember ……………………the door or do we have to go back?
A. to lock
B. lock
C. locking
Grammar › View
PUNCTUATION: Are the comma(s) in the right place(s) in the following sentence (if any)?
In theory, the dark smoke from the burning oil wells absorbs sunlight, and the surrounding air is heated.
A. Yes
B. No
