—I'm sorry, but there's no smoking room in this section on the train.—Oh, I ____that, and I won't smoke again.
The machine is easy to _______if you follow the instructions.
_____who had arrested him three times for drug-taking.
To help Tom improve his English, I_______ that he take some online courses.
After retirement, she _____ herself in _______the poor children.
Preparations have been ______for the project and it can be started at any moment.