22. The problem is too difficult for us to solve.
7.6.
2. Because I can't read Spanish, I have had to read the document translated
3. Because she is a newcomer, she may need some help.
4. Because he tiptoed into the room, he didn't wake up the baby.
5. Because of the hot weather, the children are going swimming
6. Because of feeling tired, she went to bed early.
8. Because of the noise, I can't study.
9. Because I couldn't hear the spokesman, I moved to the front row.
10. Because of the thick fog, the train was late
11. Because of the carelessness of Peter/ Peter's carelessness, he lost the game
Since Peter was careless, he lost the game.
12. I don't think it is easy to study Vietnamese
13. The local residents find the heavy traffic annoying
