1. Because there was so much graffiti on the buildings' walls. 

2. The author felt insecure .

3. Because she thought they might fall down.

4. She was busy with her assignments that her didn't tidy her room for 2 weeks.

5. She felt so much stress that she did not to study / Looking at the messy room caused her so much stress that she did not to study.

6. She decided to clean the room and put her things in their proper places.  She also bought a small plant and placed it in a corner. 

-> Để ra đáp án thì bạn phải đọc kỹ càng nội dung thì mới biết hướng giải được nhé. Thí dụ như câu 4 chẳng hạn bạn có thể ghi hai cách

1 Because there was so much graffiti on the buildings' walls. 

2 The author felt insecure .

3 Because she thought they might fall down.

4.She was busy with her assignments that her didn't tidy her room for two weeks.

5 She felt so much stress that she did not to study

6  She decided to clean the room and put her things in their proper places.