B. Fill in each blank with the appropriate form of an idiomatic expression from this unit only. Tina: What's wrong, Matt? You look (1) ________. Matt: I know. I don't feel well. Tina: You looked fine an hour ago. It must have happened (2) __________. Matt: It did. I was talking to Mike on the phone, and after I (3) ___________ the receiver, it hit me. Tina: Wow. Do you think that you can still (4) __________ my paper for me later? You're good at finding my mistakes. Matt: Of course, Tina. You can (5) __________ me to do that for you. First, though, I'd like to lie down. Tina: Okay. Would you like me to (6) __________ the light? Matt: Thanks. I'll be fine in a while.