[ Grammar ]
In 1950, people_________use mobile phones.
A. could
B. couldn’t

Random Topics:
Adverb Of PlaceSentence StructureNouns and QuantifiersSimple Present and Present ContinuousTransportation VocabularyPresent Simple and ContinuousWishesModals for ObligationConjunctions and Sequence ConnectorsGrammar ModalsOther quiz:
Modals Posibility and Probability › ViewDavid has a chance of going to university, but he _______________ the exam next week.
A. may not pass
B. might be
C. could open
D. might not know
Grammar and Vocabulary › View
A: Are you ________ jeans?
B: Yes, I am.
A. wear
B. wears
C. wearing
Modal Verb › ViewJust as my daughter was about to leave the house on her wedding day, my son spilt some tea on her dress. We _______ the stain with some special soap before the wedding took place.
A. were able to remove
B. must have removed
C. might have removing
D. could remove
Phrasal Verbs › View
The plane will take _ in half an hour.
A. of
B. off
C. after
D. over
