Choose the correct options to complete the sentences

1. Hi! Sorry,
   [must|may|have to] I use your pen?
2. The museum is free. You
   [don't have to|must|can] pay.
3. Why are you so nervous? You
   [can|might|should] try to calm down.
4. Good morning!
   [Should|Can|Must] I help you with anything?
5. Please listen to me carefully. You
   [can|are able to|must] remember and follow the rules of our sports centre.
6. When I was a kid, I
   [could|should|might] play with Lego all day long.
7. Lily
   [might|must|is able to] go to Italy next year. She wants to study Italian there, but she doesn't have a plan yet.
8. I think you
   [are able to|may|should] tell him the truth.