idioms
vocabulary
grammar
100
sounds familiar 

rings a bell

100

(adverb) Something that happened not long ago. 

For example: 

How are you __________?

recently

100

Learning many new languages ________ fun. 

is 

200

"all the time" 

around the clock 

200

(noun) another word for "answer" 

For example: 

I haven't gotten any _________ from her yet. 

response

200

The teacher won't fail us, _________? 

will she? 
300

extremely happy

in seventh heaven

300

“being poor”

For example: 

 ________ is a problem that afflicts many people in the world

poverty

300

I am supposed to be responsible for this, ________?

aren't I?

400

very rarely

once in a blue moon 

400

 “astounding”

for example:

her teaching abilities are so ________; all of her students became proficient in english after taking her class

impressive 

400

I have been working in this company ________ 2016.

since

500

note 

heads up

500

“non-public”

For example: 

one’s identifying information is personal and should therefore be kept __________

private 

500

John is tired. He has already ______ to bed. 

gone

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