1..The Pink Palace's wall (was, were) built with pink marble.
1.was
Right
To determine whether the correct verb choice is "was" or "were" in the given sentence, we need to consider subject-verb agreement. In this case, the subject is "The Pink Palace's wall," which is a singular noun phrase.
When the subject is singular, the verb form "was" is used. So, the correct answer is:
1. The Pink Palace's wall was built with pink marble.