Fill in the blanks:
If the team does not _________, we may need to find a/an _________ solution.

The phrase "if the team does not deliver" indicates a failure to meet expectations or objectives. A "contingency solution" refers to a backup or plan B in case the initial plan fails.
The other options are incorrect:
(1) succeed, interim: "Interim" refers to a temporary arrangement, not a solution.
(2) complete, alternate: "Alternate" is not appropriate in this context; "contingency" fits better.
(4) proceed, identical: "Identical solution" does not make sense in the context of a backup plan.
Therefore, "deliver, contingency" is the most suitable choice.