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

Random Topics:
Pronoun Antecedent AgreementVerb Types and TensesGrammar - Verb Formsmust/shouldIf- ConditionalTime ConjunctionsTenses & PassiveGerund vs InfinitivePassive Modalsas...as, comparatives, superlativesOther quiz:
Tenses › View. Choose the correct form: ‘He (not, finish) his project yet.’
A. He has not finished his project yet.
B. He did not finish his project yet.
C. He has not finish his project yet.
D. He is not finishing his project yet.
Tenses › View
Identify the verb tense in the sentence: We have been waiting for the bus.
A. Present simple
B. Past perfect continuous
C. Future perfect continuous
D. Present perfect continuous
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
