[ Tenses ]
When he ___________________ (found) Microsoft, Bill Gates was only 20 years old.
A. found
B. founded
C. had found
D. had founded

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Pronoun Antecedent AgreementVerb Types and TensesGrammar - Verb Formsmust/shouldIf- ConditionalTime ConjunctionsTenses & PassiveGerund vs InfinitivePassive Modalsas...as, comparatives, superlativesOther quiz:
Grammar › ViewWe expected the meeting ______ longer, but it ended surprisingly early.
A. to last
B. lasting
C. last
D. lasted
Tenses › View
Geena ___ (work) in the company until it was shut in 2016.
A. had been working
B. has worked
C. has been working
D. worked
Grammar › ViewThe equipment I have ordered for the science lab _________ of five beakers, eleven test tubes and ten weighing scales.
A. consists
B. consist
C. is consisting
D. are consisting
Grammar › View
Today is holiday and these places of interest are open for free, so you _____ pay to get in.
A. mustn’t
B. mightn’t
C. shouldn’t
D. needn’t
