[ Modals ]
When you are playing in the playground with your friends…
A. you have to keep silence
B. you don’t have to keep silence
C. you must keep silence
D. you mustn’t keep silence

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Future Tenses › ViewBy next year, she __________ her degree.
A. obtain
B. has obtained
C. will obtain
D. will have obtained
Grammar › View
Mobile phones were invented _______ the 20th century
A. at
B. in
C. on
Grammar › ViewMy sister had trouble ____________________ her way around in the university halls.
A. to find
B. finding
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You should avoid ______ directly at the sun during the eclipse.
A. looking
B. to look
C. look
