___ is important for us___ English well.

The calculations, had they been done by hand, ______all practical value by the time they were finished

Would you mind if I used your mobile phone– _______, please.

Would you like to go camping with me when the summer holiday comes?— I really dislike camping, but I will ______ you if you insist.[ ]

Please __________your mobile phone when you are having a meeting.