Two Cheese Linguine

1 package (7 ounces) linguine
2 tbsp butter or marg.
3 tbsp all purpose flour
1/4 tsp salt
1/8 tsp pepper
1 1/2 c milk
3/4 c shredded mozzarella cheese (I usually add at least 1 cup)
1/4 c shredded parmesan cheese
2 tbsp lemon juice

Cook linguine according to package directions. Meanwhile in a skillet over low heat, melt butter. Stir in flour, salt and pepper until smooth. Gradually stir in milk. Bring to a boil; boil and stir for 2 minutes or until thickened. Remove from heat. Combine cheeses; toss with lemon juice. Add to the sauce; stir until cheese begins to melt. Drain linguine; add the cheese sauce and toss to coat.

I have also added:
chicken
garlic
mushrooms