Read these sentences and fill in the gaps with the correct variant (must, mustn’t, have to, don’t have to, doesn’t have to or has to).

1. It's raining outside. Tim ........
take his umbrella.

2. Mr. Dickson is travelling abroad this summer, so he ...........
get his passport soon.

3. It's freezing outside, so we ...............
take a taxi now and not walk.