Sometimes you need to slow ________in order to vitalize yourself while learning a foreign language.
A. down
B. off
C. away
D. into
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Sometimes we need to step ________ and don't be in such a hurry.
A. back
B. forward
C. backward
D. front
Have you set ________ some time and energy for your after-school learning?
A. apart
B. aside
C. away
D. aloud
We need to ensure that every ______ threat or barrier to the new way of communication is removed.
A. secret
B. feasible
C. doubtful
D. potential
Scientific ______ is an important driving force for industrial revolution.
A. motivation
B. creation
C. innovation
D. operation