★ Passive Voice and Modals
Marie Curie developed portable _______________ which were named _______________.
A. X-gray / little Curies
B. X-rays / little Curies
C. X-rays / small Curies
D. X-rays / little Maries
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You _______________ not litter.
A. should to
B. have to
C. must
D. has to
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