Negotiations, dealing with interruptions and interrupting others, dealing with the case when you just don't know the answer, borders between formal/informal speech, joking.
In my humble opinion, recommendations given are good but probably not cover all required aspects of English. I would rather recommend just focus on rehearsal (as if you would do in your mother language) - sometimes we get stuck on things looking simple from a glance.
Negotiations, dealing with interruptions and interrupting others, dealing with the case when you just don't know the answer, borders between formal/informal speech, joking.
In my humble opinion, recommendations given are good but probably not cover all required aspects of English. I would rather recommend just focus on rehearsal (as if you would do in your mother language) - sometimes we get stuck on things looking simple from a glance.