[ Subject-Verb Agreement ]
What (does, do) scientists know today about elements?
A. Does
B. Do

Random Topics:
ApologizingSimple vs Continuous Past TensePrepositions - ConjunctionsIndefinite PronounsSimple, Compound, Complex SentencesPast Tense and Perfect TensePrepositions and Prepositional PhrasesPoetryTenses and StructureSimple Present Tense vs Present Continuous TenseOther quiz:
Tenses › ViewOne of my friend ________ reads newspaper.
A. doesn’t
B. don’t
C. never
D. haven’t
Present Tenses and Connectors › View
We don’t ____ at night.
A. reading
B. read
C. aren’t reading
D. don’t reading
First & Second Conditional › ViewIf you ______ the job, you should tell her.
A. didn’t want
B. don’t want
C. won’t want
Grammar › View
Identifying Active and Passive Voice: The popcorn, nachos, hot dogs, and sodas were dropped on the dusty baseball diamond by the child.
A. Active Voice
B. Passive Voice