If you have a footrest, you sit in a chair (hopefully a soft, comfortable one), pull the footrest near to the chair and put both feet up on it: How nice to come home from a day of job hunting to a chair with a footrest.
It takes your lower body pain off you.
It is not advisable.
No, it is not advisable to use the HHO dry cells in automobiles.
It would not be advisable to use any paint on a keyboard in case it gets into the mechanics.
I went to the unemployment office.
The diplomatic officials walked into the office.
Yes. Equipment labels can help identify stolen items and help with organization. Some office equipment can be confusing and look like others, so labels will help you and anyone else using your equipment.
It depends on what kind of work they do. If they are programmers, they will use compilers. Any other kinds of computer work in an office would not involve compilers, so most people in an office would not use one.
Entering a lions den without adequate backup is not advisable even if you are brave
No, it is not advisable to use a faulty power strip with damaged wires, as the user takes the risk of fire.
This phone would be acceptable for business use in an office with few phone lines. For large-scale use, a more robust system is recommended.