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 and Idioms › ViewChoose the correct usage of the subjunctive mood:
A. It is essential that he attends the meeting.
B. It is essential that he attend the meeting.
C. It is essential that he attending the meeting.
D. It is essential that he attended the meeting.
Grammar › View
Thanat__________his teeth before breakfast every morning.
A. will clean
B. is cleaning
C. cleans
D. clean
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