[ Past Participle ]
Know knew ……
A. Knowing
B. Knewn
C. Knowed
D. Known

Random Topics:
would should couldComparative AdjectivePossessive Pronouns and Adjective PronounsRelative ClauseFamily Vocabulary and GrammarParticiple Clauses & Cleft SentencesFirst Conditional SentenceCountable & Noncountable NounsPrepositions and ConjunctionsModals of DeductionOther quiz:
Passive Voice in Past and Present Tense › ViewThe gardener waters the flowers every evening.
A. The gardener are watered the flowers every evening.
B. The flowers is watered by the gardener every evening.
C. The flowers are watered by the gardener every evening.
D. The gardener is watered the flowers every evening.
Modals and Responsibilities › View
You ___ get enough sleep.
A. must
B. need to
C. ought to
D. responsible for
Grammar › ViewI would do helped you what you if were
A. would
B. if
C. you
D. were
Grammar › View
___ he arrived late, he still managed to catch the train.
A. Although
B. Even though
C. Despite
D. However