Read the given sentences and choose the correct modal auxiliaries to fill in the blanks.
Eric is a famous film director, his movie ­­­­_____ be amazing.

The correct answer is: Must

Willis a modal verb. We use 'must' when we want to say it is necessary or very important that something happens in the present or future. We use 'will' to give emphasis to an opinion. We use 'will' to make an assumption or to reach a logical conclusion about something that is very likely to be true. 'Eric is a famous film director, his movie will be amazing', here the modal verb 'will' used to reach a logical conclusion.