Mediterranean vegetable pasta salad

1. 1. cook pasta according to package directions; drain.
2. Rinse with cold water to cool quickly; drain well.
3. 2. in large bowl, toss cooled pasta with cucumber, tomato and dillweed.
4. 3. in small bowl, stir together dressing and yogurt; stir into pasta mixture until evenly coated.
5. 4. cover; refrigerate, stirring occasionally.
6. Sprinkle with cheese before serving, if desired.
7. 8 servings (about 1 cup each).
8. For best results, use american beauty rotini; ideal by san giorgio rotelle or rotini; p&r rotelle or rotini; ronzoni rotelle or rotini; san giorgio rotelle or rotini; or skinner twirls.