[ Vocabulary and Grammar ]
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:
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