Your studies should always be a high ---
priority
High--- trains regularly ply between Paris and Lyons.
speed
Develop, make progress
come on
Do work, research, experiments
carry out
Investigate
look into
Think of an idea or a plan
come up with
It's high --- you got that car repaired.
time
Calculate, solve a problem, understand a situation
figure out
Connect to a machine, electricity supply, etc.
plug in