1. the picture was painted by my sister
2. he was laughed at by his friend
3. the soil was prepared by the gardener
4. his words must be listened to by us
5. the tanks can store the water
6. the weak shouldn't be insulted
7. the bill should be payed today
8. you're being watched by me very carefully
9. letters are being written by john
10. the river has a new bridge built across it
11. the results have been announced by them
12. why was it done by you?
some may be wrong
Actually, I am not too sure the question is well phrased. Translators do not decide on character development, conflict resolution or dialogue: they just need to stay faithful to the original text, those decisions are up to the original author.
so the best answer is "word choice", but that's not exactly "structural".
Unless the option of "dialogue" means the word choice in dialogue, but I don't think so.
I would say that a good answer would be "word order" or "grammatical construction".
Answer:
The narrator notices that the folks living in the cabins are actual gold rush pioneers who did not profit before the rush stopped. He feels they are arrogant guys who would sooner cut relations with distant relatives than confess they had not made it wealthy.
Mike did not pass the driving test, even though it was incredibly easy.
