[ 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:
Present Simple Tense › ViewSimouy _____(tend) to study abroad one day.
A. tendes
B. tends
C. tend
Phrasal Verb › View
I don’t know where my book is. I have to look___ it.
A. up
B. for
C. in
D. out
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
