[ Grammar and Vocabulary ]
Choose the best option to fill in the gap: I believe that the only way for us to reduce global warming is to cut down ___________ energy use.
A. in
B. on
C. to
D. at

Random Topics:
Conditional TypesWish + Verb 2Quantifiers / Prepositions of Time and Comparative AdjectivesGrammar / PronounsSentence CompletionGrammar (want to/ need to/ have to)Grammar for TOEFLModal Verbs for PossibilityTenses and Word FormationGrammar: so and suchOther quiz:
Grammar › ViewJake: “Sure. No problem.” Lucas: “____”
A. May I ask who’s calling?
B. Would you mind if I put you on hold?
C. Is there anything else I can assist you with?
Vocabulary › View
rock that forms when magma or lava cools and hardens
A. igneous rock
B. sedimentary rock
C. metamorphic rock
Grammar › ViewThe librarian asked us _______________ so much noise.
A. don’t make
B. not make
C. not making
D. not to make
Perfect Verb Tenses › View
Identify the tense of the following sentence: “By the time we arrive, they will have left.”
A. Present Perfect
B. Past Perfect
C. Future Perfect
D. Simple Future
