[ Grammar ]
You would save energy if you —- the lights more often.
A. switched off
B. switch off
C. had switched off

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Grammar TOEFLPrepositions after VerbsPresent and Past Simple PassiveTenses and ArticlesNeither/Either/All/NoneGerunds in SentencesLinking Words & PhrasesVerb Tenses and UsageZero & First ContidionalIf Conditional Zero and OneOther quiz:
Tenses › ViewI’ll think about your suggestion while I ……….. for you.
A. am waiting
B. was waiting
C. will be waiting
D. will wait
Grammar › View
I think the government should _____ limit the number of private cars or widen the roads to solve the problem of traffic jams.
A. either
B. neither
C. both
D. not only