29. Many teenagers don't know how to do _____ because their mothers or fathers usually wash their clothes for them.
(A) experiments (B) assignments (C) laundry (D) grocery
43. A: I called you at eight last night, but you weren’t home.
B: I was! I couldn't answer the phone because I _____ my hair.
(A) had washed (B) washed (C) was washing (D) have washed
52. Which is the best answer when a shop clerk says, “Can I help you?”
(A) No, I can’t. (B) I’ll just look around. (C) Never mind. (D) Go do your things.