[ Relative Clauses ]
We have obligation to our customers to make sure they know ______________________ to use our products correctly.
A. why
B. because
C. which
D. how

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Adjectives & PrepositionCOUNT - NONCOUNT NOUNSPresent Simple x Present ContinuousPast Simple vs Present SimplePast Simple, Present Perfect TenseVerb Moods and Vague PronounsTransitional Phrases and ConjunctionsComparative and Superlative AdjectivesAuxiliary Verbs & Question TagsPassive Voice in Past Simple TenseOther quiz:
Conjunction › ViewKumar let his friends play with his bicycle _____ not his brand new basketball.
A. and
B. or
C. so
D. but
Grammar › View
`What are you looking for?’
‘My wallet; I don’t know where I … it.’
A. have put
B. have been putting
C. had put
D. am putting
E. was putting