Нужно вставить слова must или mustnt.

 

A real friend ____ always help you if you need help.

A real friend_____ tell your secrets to anyone.

A real friend _____ make you happy if you are sad.

A real friend _____ listen to you if you have a problem.

A real friend _____ tell you lies.

A real friend _____ share his/her bicycle with you havent got one.

Заранее  спасибо!