Ответ:

  1. will carry — This bag is very heavy.
  2. will use — You can borrow my phone.
  3. will help — I can’t do this maths calculation.
  4. will have — I’m thirsty.
  5. won’t lose — What would you like to drink?

Правило: will употребляется для решений, предложений и обещаний, принятых в момент разговора.