Astronomers haven’t _______ signs of life in space.
A. see
B. saw
C. seen
Random Topics:
Can, Could, May, MightArticles with Proper Nounsused to vs be used to vs get used toPast Simple, Past Continuous, Past Perfect, Past Perfect ContinuousPhrasal Verbs and Verb FormsSentences vs Run-OnsIndefinite ArticleTOEIC Grammar and Vocabulary ReviewNoun and PronounVerb AgreementOther quiz:
Use of Prepositions or Conjunctions › ViewOboro will always ____ his friends.
A. stand up for
B. stand down for
C. stand across for
D. stand beside for
Tenses and Voice › View
Differentiate between the present perfect and past perfect tenses.
A. Present perfect describes actions that will happen; past perfect describes actions that are currently happening.
B. Present perfect is used for future actions; past perfect is used for ongoing actions.
C. Present perfect indicates relevance to the present; past perfect indicates an action completed before another past action.
D. Present perfect indicates an action completed in the future; past perfect indicates an action that is still ongoing.
Grammar › ViewHad you….been to Lisbon?
A. ever
B. never
C. already
D. since
Grammar › View
How many students in your class _________ from Korea?
A. comes
B. come
C. are coming
D. came