1) If you are invited to a Brazilian's house for dinner, you ___________ arrive at least 30 minutes after the time mentioned. a) must b) should 2) You ___________ give purple flowers as a gift in many countries. a) mustn't b) don't have to 3) All personnel _______ read the health and safety notices in the building. a) should b) must 4) Staff ___________ disclose information on the project unless authorised. a) don't have to b) mustn't 5) I think you ___________ encourage the team to develop interpersonal skills. a) should b) must 6) Simone ___________ work so hard - she looks very tired. a) doesn't have to b) shouldn't 7) When going to a new country to do business, you __________ do some research into their culture. a) should b) must 8) You ____________ pay immediately. We can offer you credit. a) mustn't b) don't have to 

Advice, obligation and necessity

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