Which sentence is grammatically correct?
A. Dolphins are playful creatures that like to jump flip and spin in the air.
B. Dolphins are playful creatures that like to jump, flip, and spin in the air.
C. Dolphins are playful creatures. that like to jump flip, and spin in the air.
D. Dolphins are playful creatures that jump, flip, and spin in air.

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Passive Voice in Past and Present TenseWish clauseGerund after Prepositions and Certain VerbsPassive SentencePast or Present Verb TenseBecause of & Inspite ofPrepositions - ConjunctionsBe used to vs used toMixed GrammarGrammar Comma UsageOther quiz:
Adjective Clause and Adverb Clause › ViewLast week, our cat gave birth to a litter of kittens, but we didn’t know where ________.
A. is our cat
B. our cat is
C. our cat was
D. was our cat
Present Tenses › View
I ___________________ any English exams yet.
A. haven’t been having
B. haven’t had
Past Tense › ViewLast summer I _____ (help) Dad out at the office.
A. helped
B. was helping
C. had helped
D. had been helping
Verbs & Phrasal Verbs › View
Just _______ this form and sign it.
A. fill up
B. fill in
C. fill out
D. fill on