the ability to be maintained at a certain rate or level
A. energy conservation
B. human impact
C. renewable resources
D. sustainability
E. availability

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Articles & Compound NounsAction vs Linking Verbs/ Verb PhrasesVerb AgreementLinking Words and PhrasesSimple Past ContinuosTenses and QuestionsReflexive Pronouns & Modal VerbsTypes of PhrasesPreposition of PlaceVerbsOther quiz:
Grammar › ViewWhich sentence is written correctly with an introductory phrase or word?
A. Yes, I am aware of the increase in participation.
B. Yes I am aware, of the increase in participation.
C. Yes I am aware of the increase in participation.
D. Yes I am, aware of the increase in participation.
Grammar › View
A _______ of kittens is drinking milk in the kitchen.
A. group
B. litter
C. flock
D. gang
Grammar › ViewChoose the sentence that is written correctly.
A. I am remembering your face!
B. I remember your face!
C. I am remember your face!
Grammar › View
When Paul was at my flat yesterday, he asked if he _______________ use the phone.
A. can
B. could
C. may
D. must
