Greek Pasta Salad I

1/2 cup red wine vinegar

1 1/2 teaspoons garlic powder

1 1/2 teaspoons dried basil

1 1/2 teaspoons dried oregano

3/4 teaspoon ground black pepper

3/4 teaspoon white sugar

2 1/2 cups cooked elbow macaroni

3 cups fresh sliced mushrooms

15 cherry tomatoes, halved

1 cup sliced red bell peppers

3/4 cup crumbled feta cheese

1/2 cup chopped green onions

1 (4 ounce) can whole black olives

3/4 cup sliced pepperoni sausage, cut into strips