Question

No one is allowed in the building _____ they show their ID badge.
unless
without
as long as
in case

Answer 1

Answer:

Unless

Explanation:

Because it is the only appropriate conjunction.

Without also could have been the answer if it was Present Continous.

"As long as" and "In case" is for negative sentence.

Answer 2

Answer: WITHOUT

Explanation: No one is allowed in the building without they show their ID badge