12. вставьте нужные предлоги. at, after, from, in, of, off, on, to, up, without 8. she always puts __ tasks until the last minute. 9. when will you give __ the idea of changing your job? 10. i look forward __ hearing from you soon. 16. combustion was incomplete because __ insufficient oxygen being present.

8. She always puts off  tasks until the last minute. 9. When will you give up the idea of changing your job? 10. I look forward to hearing from you soon. 16. Combustion was incomplete because of insufficient oxygen being present.