take on

take up

hand in

hand back

put together

put off

look back

look ahead

keep on

keep to

make up

break down

give up

turn down

let down

work out

employ someone

start a new hobby / activity

give something to someone in authority

return something

prepare something by collecting ideas and information

delay something

think about something that happened in the past

think about / plan for the future

continue doing something

stay on a particular path or course of action

invent OR work when you don't usually work because you haven't done enough

stop working (a machine) OR separate into smaller parts to make it understandable

stop trying because something is too difficult OR stop doing something you do regularly

turn a switch so the machine produces less heat/sound OR refuse an offer, request, or invitation

dissapoint someone OR move something into a lower position

plan something in order to solve a problem OR do exercise to get fitter