[ Vocabulary ]
Do not cause a change in an object’s motion.
A. Unbalanced forces
B. Balanced forces
Select your answer:
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Vocabulary › ViewWhat does ‘concentration’ refer to?
A. the ability to concentrate
B. the treatment of an illness or injury over a period of time
C. the things around you at a particular time
D. the action of thinking hard about something
Grammar and Vocabulary › View
I’m very excited ……our new house!
A. about
B. for
C. at
D. on