. The study focused on the environmental ……… factors -species depend tor their survival, highlighting the criticaı nature of biodiversity.
A. in which
B. when
C. where
D. that
E. on which

Random Topics:
The Past SimpleVerb-ing and InfinitiveSentences and Non SentencesInfinitive FormsSo / Neither / Either / TooAdjectives & AdverbsPassive to ActiveNoun, Verb, AdjectivePresent simple, Present continuous, Singular, PluralPast Simple and Past ProgressiveOther quiz:
Adjective or Adverb › ViewThe students seem _______ when they see their favorite teacher.
A. happy
B. happily
Grammar › View
We __________ each other since our secondary school days and we are still in touch with one another.
A. know
B. have known
C. had known
D. have been knowing
Grammar › ViewAre these sweets _____?
A. He
B. I
C. We
D. Yours
Reported Speech › View
Yolanda said, “I have to leave the class before 12:30.”
A. Yolanda said that I have to leave the class before 12:30.”
B. Yolanda said that she has to leave the class before 12:30.”
C. Yolanda said that she had to leave the class before 12:30.”
D. Yolanda said that she has had to leave the class before 12:30.”
