Choose the correct words

1. You mustn't [operate|manage|deal|function] machinery without the right training.
2. I'm unemployed at the moment. I'm currently looking for a [profession|job|work|post].
3. All applicants for the post must hold an honours [permit|licence|certificate|degree] in Marketing.
4. You need to have [plain|basic|simple|primary] computer skills to be considered for the job.