[ Grammar ]
Mark Zuckerberg and his classmates ________ Facebook while he ________ Harvard University.
A. invented / attended
B. were inventing / attended
C. invented / was attending
D. were inventing / was attending

Random Topics:
Intensifiers: Really vs VeryVerbs and TensesPreposition of PlaceCompound Words and SentencesCommon & Proper NounsFuture Perfect TenseModals of Obligation and PermissionSuperlative & Comparative Adverbstoo / enoughGrammar - too & enoughOther quiz:
Modals for Obligation › ViewHe works in a call-centre and he sometimes _____ work at night.
A. should
B. has to
C. must
D. shouldn’t
Simple Present and Present Continuous › View
Which of these sentences is in Present Continuous Tense?
A. a) Mike will bake chocolate cookies in the kitchen.
B. b) Mike is baking chocolate cookies in the kitchen.
C. c) Mike baked chocolate cookies in the kitchen.
D. d) Mike bakes chocolate cookies in the kitchen.
