Thanks. I realised that the idea of "completeness" is not correct in explaining "the".
I copied the original text. The answer to gap(1) provided by the book is zero article. Therefore "deliveries" can not be interpreted as "deliveries" mentioned before. That is why I understood "deliveries" as part, not all, of the deliveries by "all the other suppliers" are made to a precise schedule.
Now I don't know how to understand (2): a. as (1) hasn't been solved.
Hope to have more of you and everybody's opinions.
The factory was opened in 1996 and is one of the most advanced in the world. At the plant, independent component suppliers also have production facilities, manned by their own staff, producing doors, seatbelts etc. All the other suppliers are linked to the production control system and _______ (1) deliveries of parts and materials are made 'just-in-time' to ________ (2) precise schedule.
This is an exercise on articles.
The answer is: (1) nothing (2) a
I filled in the gaps: (1) the (2) the