Necessity - need to/ don't need to

A friend from Australia stayed with me for a month. I got a $500 phone bill, and all the international calls were to Australia. My friend said she didn't make the calls. What would you say to your friend?

I had a job interview but i was too nervous and they didn't call me back? What should i do?

I forgot about my best friend's birthday party. I didn't call him to apologize. I was too embarressed. What should i do?

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