[ TOEFL ]
The helicopter is able to hover in ___________ powered rotors produce lift even at zero forward speed.
A. flight because of the
B. flying the
C. the flying of the
D. flight because the
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Verb + Infinitive or GerundAdverbs (manners & modifiers)Tenses (Present, Past, Future Forms)Active Voice-Present tenseCountable & Uncountable NounsAbilityNoun PhrasesGrammar : Must (Necessity)Vocabulary and PhrasesAdverb & Compound SentencesOther quiz:
Grammar › ViewThe children ________ the lost puppy.
A. have find
B. is finding
C. have found
Irregular Verbs › View
You haven’t ______________ all that money already, have you?
A. spend
B. spent
C. spended
Grammar › ViewI….(do) my homework now.
A. do
B. doing
C. am doing
D. am do
Tenses › View
I had helped my neighbor before I fixed his car.
A. Future Perfect
B. Present Perfect
C. Past Perfect