Why? Why Not?

Answer these questions that have answers that contain a 'y'. Did I mention the clues are a bit cryptic?
Quiz by Kevin1
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Last updated: December 12, 2017
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First submittedDecember 12, 2017
Times taken14
Average score20.6%
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Hint
Answer
To hate what someone else has
Envy
Hole for corpse
Bury
Slippery, covered in grease-like substance
Oily
Computer eating food takes these
Byte
Is this one letter or 3? Not sure, but you know it's here somewhere.
You
Title with question-like proporties
Why
This allows entry
Key
Open wide if you need rest
Yawn
Hand over money in exchange for something you want
Pay
4 year climber, green
Ivy
Look up. Not right now, but, you know...
Sky
You were one of these in one of the above.
Buyer
Hint
Answer
No truth leaves his lips
Lying
Fifty? No. Seventy? No.
Sixty
A crease in the Earth, like gorge, but without eating.
Canyon
Mental, not in there right, or left, mind.
Crazy
Twenty less that a number you may have already typed.
Forty
The bird that gets the worm.
Early
If you don't laugh, well, I don't know.
Comedy
What the above is.
Funny
A great emotion, got to be one of the best.
Happy
This normally comes when you are the above.
Joy
One of the words that is in my 'Most Misspelled Words' Quiz, it's clue included beat and tempo.
Rhythm
Hint
Answer
And. Breathe.
Oxygen
Colour that symbolises fressness, honor, positivity, but also, cowardice and caution.
Yellow
Gem, normally transparant.
Crystal
School. We are supposed to, but who does, really?
Study
It sounds like an advanced school, but is it really?
Academy
Science with space
Physics
Science with periodic tables
Chemistry
Science with body
Biology
100 years is a while.
Century
There is a CAB LIMIT IN PITYO, whatever that means.
Incompatibility
Mirror image on both sides. SLY MINT CREAM (-N), that's nice.
Symmetrical
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