I’ve got ______work to do on a ________ cold day.
To qualify John for this new job, I recommended that he ____ some online courses first.
Walking alone in the dark, the boy whistled to ___ his courage.
Sleeping pills _____ be taken sometimes for a good night’s sleep but not so often that it becomes a habit.
I have no idea about what colours look good ____my skin.
_____with care, one tin will last for six weeks.