–Carla _______ go to that historical museum after school when she was a teenager. --No wonder she is so familiar with it. 

---Must I work out the problem right now?---Yes, you _______. It’s very serious. 

 I’d rather ________ than _________

Please do not feed the fish; they ________ die if they eat too much.

—Whose purple coat is this?—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.