②→ Idioms elevate __ and confidence for non-native speakers.
fluent
fluency 
current 

③→ Using English idioms is a simple way to tell the __ between a beginner and an advanced speaker of English. 

different 
difference
differentiated 

④→ __ native speakers don’t use or understand 100% of the idioms in the English language.
Ever
Even 
Everest

⑤→ 名古屋伏見英会話スクール ロケイシャス (LoQuacious) Instructors always __ to use idioms when teaching.
tend
tender 
amend

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