找出每句中的一处错误并改正。
1. She often (A) helps (B) her mother doing (C) some (D) housework.
2. Do (A) you have (B) delicious something (C) to eat (D)?
3. First (A), put (B) the mayonnaise (C) in (D) a slice of bread.
4. Who (A) is (B) the girl (C) at (D) the bike?
5. Here (A) are (B) three slice (C) of chicken (D).