[ Use of Prepositions or Conjunctions ]
After so many trials, the experiment ____.
A. paid up
B. paid for
C. paid off
D. paid out

Random Topics:
Phrase or ClauseGerunds and InfitinitivesModals and Past ModalsGrammar and Verb TensesZero & First ContidionalTenses and Verb FormsArticle & PrepositionDistinguishing Future TensesPast simple regular verbsComparative AdjectivesOther quiz:
Simple Past Tense and Past Perfect Tense › ViewPaul : Why didn’t you come to the studio?
Alicia : The rain was big, and I was trapped.
Paul : Mr. Bane . . . . us how to play drum correctly, you missed the lesson.
A. Teach
B. Teaches
C. Taught
D. Teached
Modal Verbs › View
You look tired. You ____ go to bed so late.
A. should
B. shouldn’t
C. mustn’t
D. must