a system of ideas to explain something
A. servant
B. evaluate
C. theory
D. preserve

Random Topics:
Was & Were QuestionsInfinitive or GerundAdverb and Noun ClausesPerfect and Past TensesSo / Neither / Either / TooTenses and OpinionsUnscramble SentenceThe Simple Present TenseUncountable NounsQuestion TagOther quiz:
Tenses and Article › ViewSelect the sentence that correctly uses the past perfect tense.
A. She had left before you arrived.
B. She left before you arrived.
C. She leaves before you arrive.
D. She is leaving before you arrive.
Progessive Tenses › View
The following sentence is written in _______________.
By next month, they will have been living here for 20 years.
A. future tense
B. future progressive
C. future perfect progressive
D. future perfect
Grammar › ViewWe __ the studio after we finish recording the scene.
A. are clean
B. are supposed to clean
C. is supposed to clean
D. are supposed to cleaned
Grammar › View
It was ________ that everyone answered it correctly.
A. so a simple question
B. such a simple question
C. too simple question
D. a more simple question
