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Quantifiers & Modal VerbsRelative - ConditionalWord Form & Verb TenseSingular and Plural Nouns3rd Person SingularModal Verbs in ConditionalsVerbs and Possessive AdjectiveRoot WordAdverb of FrequencyPresent, Past and Future TenseOther quiz:
Modals › ViewPE teachers ….to be physically fit.
A. mustn’t
B. are allowed to
C. need to
Grammar › View
Before these automatic devices _____________ with a general audience, they’ll have to be affordable and easy to use.
A. pave the way
B. sustain
C. catch on
D. end