The word a0 means instruction and training.

The best way is to swollow and hold in your breath

The talk test measures ease of speaking during exercise;

Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.

Chewing tobacco is a type of smokeless tobacco