[ 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:
Grammar › ViewMy father is ___ on his old bike.
A. working
B. work
C. works
D. worked
Preposition › View
She decided to search ___________ her lost keys.
A. in
B. on
C. with
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D. Rockcentric
Prepositions › View
_____ you have any problem, just ask for help.
A. When
B. After
C. Before
D. Until