Ответ:
1. There is a lot of garbage at the bottom of the river.
2.Father angry at son for his lies
3.Unusual learning conditions are a real challenge for me.
4.My friend likes to talk riddles.
5.At the bottom of the page, she saw a note from the teacher.
6.All Christmas gifts were packed in colored paper.
7.What is the reason for your decision?
8.Are you mad at me?
9. On cold days, he wraps a warm scarf around his neck.
10.Exercise 10 is at the top of the page.
11.He was bored of translating sentences