[ Grammar ]
Mobile phones were invented _______ the 20th century
A. at
B. in
C. on

Random Topics:
Conjunctive AdverbClause Markers TOEFL GrammarWould rather/ would prefer/ would likeVocabulary Spelling GrammarGrammar - may & mightIF CLAUSEDescriptionsComparison & Modal Verbs in Passive VoicePrepositions after VerbsGrammar - Wh QuestionsOther quiz:
Vocabulary › ViewA powerful tornado wreaked _____ on the small village.
A. gaunt
B. gullible
C. haven
D. havoc
Modal Auxiliaries › View
A: Is Jodie a doctor now?
B: Not yet, but almost. She finished medical school last month, but she hasn’t taken her exams yet. She _____ be a doctor until she passes them.
A. can
B. can’t
C. might
D. might not
Homonyms › ViewTell the ___ truth and nothing but the truth.
a. hole
b. whole
Present Simple › View
Louise ________ a pilot.
A. am
B. is
C. are