[ Grammar ]
Our research measures the impact of_______ on this particular eco-system.
A. human activity
B. sea level
C. greenhouse gas
D. global warming

Random Topics:
Conditionals / Unreal PastFrequency Adverbsduring, for, whileSecond ConditionalsTenses and ArticlesComplex PrepositionsPresent SimpleWish - beginner-ed or -ingModals and Adjectives (ed-ing)Other quiz:
Verb Tenses › ViewChoose the correct tense for this sentence:
My teacher was teaching the verbs in class when he got a call.
A. present simple
B. past simple
C. present continuous
D. past continuous
Grammar › View
Alex _____ a Vietnamese until he met Linh.
A. had never meet
B. have never met
C. never met
D. had never met
Comparatives - Superlatives › ViewShe always has a smile on her face. She is the ____________ person I know.
A. happy
B. happier
C. happiest
Tenses › View
Dr. Taviel ____________ free consultation services in September.
A. provided
B. provides
C. will provide
