[ Grammar ]
Concentration is ________ by alertness.
A. Help
B. Will help
C. Helps
D. Helped
Random Topics:
Cleanup vs. Clean UpSimple Past TenseComparative Adverb Will, Be going to, Present ContinuousPresent Simple Positive and NegativePersonal & Possessive PronounsSubjective and Objective PronounPresent Progressive TenseExclamation
Other quiz: Grammar
The shape of a glass is…
A. Cylinder
B. Triangle
C. Hexagon
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