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).                                                                    

在建筑工程费的估算方法中，（）要以较为详细的工程量资料为基础，工作量较大。

A.概算指标投资估算法

B.单位建筑工程投资估算法

C.单位实物工程量投资估算法

D.比例估算法