Find out the mistake in the following sentences:
1. Although she had no money herself, she succeeded in building schools for poor.
A B C D
2. My sister and I make turns laying the table for meals.
A B C D
3. Do you get annoying if your parents ask you to help out in your free time?
A B C D
4. Even on the most careful prepared trip, problems will sometimes develop.
A B C D