[ Prepositions ]
The computer technician is working ____________ the problem right now.
A. at
B. on
C. of
D. for

Random Topics:
Grammar : Must (Necessity)Comparison DegreeGrammar-Present Continuous-Sentence MakingFuture SimplePresent Perfect & Past Simple TenseModals: Possibility, Necessity, ExpectationSimple Future - WillGrammar: Have toApostrophes and GrammarRelative Clauses and Past PerfectOther quiz:
Tenses › ViewWhile my dog ___ around, I ___ on the phone with a friend.
A. was running; was talking
B. were running; talked
C. run, were talking
Tenses › View
I had washed my hair.
A. Future Simple
B. Present Perfect
C. Past Simple
D. Past Perfect
Grammar › View____ as the representative at the conference, she felt extremely proud of herself.
A. be chosen
B. having been chosen
C. on choosing
D. Having chosen
Conditional Sentences and Verb Form › View
Unless she_______, she’ll be late.
A. hurries
B. didn’t hurry
C. hurried
D. will hurry
