an unmanned aircraft/aircraft - not operated by people
we followed the bear's tracks in the snow - marks left by people or animals
idiom - to cover your tracks
cruel
I want to have my hair dyed(wash away)
my time management is poor
on the other hand, I often encounter some difficulties that I need to handle, I want to take time off
stressful situation; stressed people
go on/take personal/sick/maternity leave(get over illness)
former and latter; link, connect
chit-chat = informal chat
idle chatter/gossip/speculation
cellular data
laser: a beam of light
follow a pattern
a motor scooter; scooter; electric cars/bikes; electronic devices-PCs, cell phones
former=ex
participate in = take part in
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