[ Prepositions ]
Susan has two ________.
A. Sister-in-laws
B. Sisters-in-law
C. Sisters-in-laws

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Verb Moods and Vague PronounsModal PossibilitiesPresent Simple and Continuous TenseGrammar: Have toObject PronounAdverbs and Time ExpressionsShould and Shouldn'tNoun and PronounCountable QuantifiersPresent simple or Past simpleOther quiz:
Vocabulary › ViewWhat word describes something that is “changing frequently”?
A. Enterprise
B. Essential
C. Fluctuating
D. Function
Present and Past Tenses › View
It started to snow while we … to school.
A. had walked
B. have walked
C. have been walking
D. were walking