[ Vocabulary ]
He had to be sure to try and sleep in short intervals so he could keep the fire going.
A. intervals
B. altitude
C. Cessna
D. imbed

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Conjunctions › ViewWe wanted to go to the beach; __________, it started to rain heavily.
A. however
B. as a result
C. in addition
D. therefore
Grammar › View
……………… it’s sunny, we won’t have a picnic.
A. If
B. Unless