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Must or have to?

From the book "Gem"

Choose

1-You ....phone him before 3 pm .He won't be available after that 

(Must-have to-don't have to-hadn't to)

2-You ....phone him now.It's very urgent 

(Must-have to-dont have to-hadn't to)

I think the first is "have to" because there is an outer conditions 

The second I think it's "must" as it's an individual opinion so it's an advice

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