Preheat oven 450°.
Steam asparagus, covered, 2 minutes or until crisp-tender. Rinse with cold water; drain.
Combine oil and garlic. Brush over pitas. Arrange tomato slices and asparagus on pitas. Sprinkle with basil, pepper, and salt. Top evenly with Parmesan cheese. Bake at 450º for 7 to 8 minutes or until edges are golden.