[ Grammar and Vocabulary ]
The __________ of outer space is a very expensive activity.
A. weightlessness
B. colony
C. exploration
Select your answer:
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Word Form & Verb Tense › ViewPessimists point out that both global warming and pollution have increased _____ over the past twenty years
A. rapid
B. rapidly
C. rapidity
D. rapier
Grammar › View
As Lisa was walking through the forest, she fell into a …….. hole.
A. deep
B. deeply
C. deeper