[ Vocabulary ]
fossil fuel; a flammable gas that occurs naturally underground
A. coal
B. oil
C. natural gas
D. nuclear energy
E. renewable resource
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Past and Past Continuous › ViewI was running ____________ I fell.
A. while
B. when
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The singer is currently touring the world. ___________, she is writing new songs.
A. After
B. Meanwhile
C. eventually
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