Lula most likely complains about scout and jem's presence at her church because

she knows the finch children misbehave
she distrusts white people
she feels her space is being threatened
she thinks more white people will come to the church after this

The correct answer is: she feels her space is being threatened.  Lula believes that Jem and Scout should not be in his church. Lula was upset because they are white and he has to treat them as if they were better than the others. The church is the only place where she can be herself and feel her threatened space.

- the mistakes that have been done in the past will repeat themselves

- you will trust all the wrong people

the illustration   that would give a reader a clear understanding of the text is a picture of men constructing the frame of a building.the frame is made of iron bars. the text describes the job of blacksmiths'. these were very organised and they had different names: "the driver" and "the heater". the text describes the way in which these men worked ; they worked iron pieces as if they were playing a sport. in fact, the text wants to show the men's skills. the text also puts some emphasis on the use of '' rivets'' in construction. this kind of nails were not always used in the construction of manhattan.

some examples:

"and with an underhand toss he hurled the smoking rivet straight at the catcher, who caught it in mid-air in his catching can." men's skills

"when the driver was ready for a new " the emphasis on the rivet ( special nail used in construction).

" it against a beam to remove any cinders, and jammed it into the waiting hole. " the emphasis on the rivet.