[ Vocabulary ]
terrain
A. real or imaginary line through the center of an object
B. to turn about on an axis or a center
C. the surface of the land and its features
D. an organization in the United States that directs space travel and research
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Grammar TOEFLPresent ContinousGrammar - Present Perfect with already, just, yetSimple Past Tense (was/were)Expressing Obligation and ModalsDo not- Does notVerbs and PrepositionsMiscellaneous Grammar UsagesPresent Perfect Simple & Present Perfect ContinuousAdverb and Noun ClausesOther quiz:
Vocabulary › ViewA model of the solar system that has the sun as the center is called a _______ model.
A. Geocentric
B. Aquacentric
C. Heliocentric
D. Rockcentric
Prepositions › View
_____ you have any problem, just ask for help.
A. When
B. After
C. Before
D. Until