[ FOR & SINCE ]
Sue has only been waiting _______ 20 minutes.
A. since
B. for

Random Topics:
ConjunctionsThere is or There areVerbal CommunicationParallelism and Subject Verb AgreementPresent PerfectPronouns and AntecedentsPast Perfect & Past SimplePresent Perfect and Present Perfect Progressive TensesAdjectives & PrepositionPresent simple & ContinuousOther quiz:
Present Perfect and Past Tenses › ViewWhich verb is likely to be used in the present perfect (not continuous)?
A. Dance
B. Eat
C. Love
D. Paint
Future Tenses › View
I am telling you! I _____ stay here until he answers me!
A. am going to
B. will
Grammar › ViewJan had green eyes, but you never saw them.
A. simple
B. compound
Grammar - TOEIC › View
She is not storng enough __ to work yet.
A. to go
B. go
C. going
