[ 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:
Adverb of Frequency and Past Continuous Tense › ViewWe __________ (always,go) to the cinema every week
A. always go
B. always goes
Tag Questions › View
Sophie is not going camping this weekend,____?
A. isn’t she
B. is she
C. did she
D. didn’t she
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