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The crew is lucky they _____ the boat to a rock because the sudden storm would have blown them far from shore.
a) inflate
b) scientific
c) launched
d) anchored
Tiny ______ connect together to make up solid objects.
a) launched
b) anchored
c) particles
d) companion
The smoke was very ____, making it difficult for firefights to see.
a) anchored
b) particles
c) companion
d) dense
Today in class we learned that _____ was used in early balloons because it was the lightest element.
a) particles
b) companion
c) hydrogen
d) dense
The air pump at the gas station will _____ the front tires.
a) dense
b) inflate
c) hydrogen
d) scientific
The _______ discovery of gravity changed the way people thought about Earth.
a) scientific
b) hydrogen
c) launched
d) inflate