The stadium covers nine-and-a-half acres of land. Would the complete predicate be covers nine-and-a-half acres and the verb be covers?

3 answers

Right! :-)
In Houston my classmates and I visited the Lyndon B. Johnson Space Center. Would the complete predicate be visited the Lyndon B. Johnson Space Center and the verb visited?
Almost right.

In Houston is part of the predicate because it modifies "visited."