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Somebody (has/have) left their umbrella in the office.
has
None of the bright lights (was/were) functioning properly during the event.
was
Several of the old textbooks (needs/need) to be replaced.
need
The traffic lights (needs/need) to be fixed immediately before it (become/becomes) a bigger problem.
need / becomes
The message on the billboard about avoiding traffic (was/were) clearly visible to everyone.
was
There (is/are) a terrible storm warning and many people (is/are) worried.
is/are
