[ How much and how many ]
How ___ trees do we need to produce enough oxygen for a person?
A. Many
B. Much

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Subject Verb Agreement › ViewDogs and cats _____ not get along well.
A. does
B. do
Modal Verbs › View
They are used to talk about things we are able to do.
A. ability
B. permission
C. obligation
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A. whether
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C. neither
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Grammar › View
I will never forget _____ to London for the first time. It was amazing!
A. to go
B. going