[ Relative Clauses and etc ]
Humans __________ the planet for centuries.
A. have been damaging
B. have damaged
C. has damaged
D. have been damaged

Random Topics:
Conditional TypesCompound Nouns and Compound Adjectives QuestionsComparisionsTense,noun,preposition,quantityClauses and GerundsModals, Phrasal Verbs, Gerunds and InfinitivesClause Markers TOEFL GrammarSimple Future - PassivePresent Simple: affirmative, negative, interrogativeComparison of Adjectives and AdverbsOther quiz:
Modal Verbs › ViewI ___ to tidy my room more often, but I never seem to find the time.
A. ought
B. should
C. must
Tenses › View
I _________ my favorite song when the phone _________. (sing / ring)
A. had sung / had rung
B. am singing / rings
C. was singing / rang
D. sang / was ringing
Grammar › ViewI ________ to send this gift to Peter.
A. has
B. have
Tenses › View
____ the cake be eaten by my brother later?
A. will
B. would
C. do
D. did
