[ Modals ]
We ………………………….. recycle if we want to save our planet.
A. shouldn’t
B. must
C. don’t have to
D. need not
Select your answer:
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Grammar › ViewWhich letters are the five vowels?
A. auyoi
B. vwxyz
C. abcde
D. aeiou
Tenses › View
He gave us warning to stay away from the machine while it __________.
A. had worked
B. was working
C. would work
D. would be working