Select the most appropriate option to complete the given sentence.

He booked the tickets for the show ________.

in advance 

The most appropriate option to complete the given sentence is in advance.

The sentence is about someone who booked tickets for a show in advance because they knew that the show would be popular and tickets would sell out quickly. The word "in advance" means before something happens. It is the most appropriate option because it conveys the idea that the person booked the tickets before the show started.

The other options are incorrect.

• In demand means wanted by a lot of people. It does not make sense to say that the person booked the tickets because the show was in demand.
• In common means shared by two or more people. It does not make sense to say that the person booked the tickets because the show was in common.
• In depth means thorough or detailed. It does not make sense to say that the person booked the tickets because the show was in depth.