[ Prepositions ]
I think you’d better concentrate ____________ your work if you want to finish on time.
A. at
B. on
C. of
D. for

Random Topics:
Active & Passive VoiceVerbs & AdverbsAlthough, Though, In spite of, DespiteVerbs and AdverbsVocabulary and PrepositionsGerund and InfinitiveAdjective or AdverbKinds of NounsGrammar & ReadingModals and Past ModalsOther quiz:
Passive Voice › View1.9 billion servings of Coca-Cola ______ every day
A. are drunk
B. is drunk
C. is drank
D. are drinked
Tenses › View
_____ she _____ (read) often?
A. Does / reads
B. Do / reads
C. Does / read
D. Did / reads
Tenses › ViewWhich sentence is not past perfect continuous tense ?
A. He had been waiting since daybreak.
B. If she had gone there yesterday, she would have seen you.
C. It had been raining all night.
D. My father had been working hard all day.
Present Simple › View
Mike and Joe __________ at school now.
A. is
B. they
C. are
