[ Tenses ]
Computers that once —- up entire rooms —- now small enough to put on desktops and into wristwatches.
A. took / are
B. take / are
C. will take / are being
D. took / were

Random Topics:
Active vs. Passive VoiceConditional Sentences Type 0, 1 and 2HomophonesGrammar ClausesTime and CalendarPast simple regular verbsPassive Modals in Different TensesNoun Verb AgreementTypes of PhrasesModal and Relative PhrasesOther quiz:
Grammar › ViewEmily usually………… out with her friends
A. go
B. is going to
C. goes
D. went
Subject Verb Agreement › View
Many companies ______ criticized the government’s bill.
A. have
B. has
C. having
D. to have