“Doctor,” said the woman, “every night my son dreams he's a chicken, and then he starts acting like one. ＿＿（20）＿＿, he flaps his arms like wings, puts his head down to the ground, and starts eating bugs. ＿＿（21）＿＿, his head goes back and forth when he walks. ＿＿（22）＿＿, he even comes into my room and wakes me up at dawn.” “This is very serious,” said the doctor. “You should bring him to me at once. ＿＿（23）＿＿, he might develop other strange behaviors, ＿＿（24）＿＿ building a nest.” “OK, Doctor,” said the woman. “But I'm going to miss the eggs.”