Three puzzles

I present to you a kind of blitz - three small puzzles, starting from the most bayan and ending with the one that you won't even find in Google =)

1. wall, brick, clock, station ...
(continue the sequence)

2. l, s, d ...
(continue the sequence)
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3. kr.se.t. - what is it?
Attention! The second task has not yet been decided!