No matter how healthy you _____be，you need to consult a doctor from time to time.

---Why not wear your miniskirt, Rose? --- Well, my legs are too thick, if you ______ know.

—Mary broke up with me!—You_ _have forgotten about the Valentine's Day．

Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.

—Are you coming to Jeff's party?—I'm not sure.I ________ go to the concert instead.