1. The dog guided him go through the forest in dark successfully.
2. The old woman thanked the boy for offering his help to cross the street.
3. Our English teacher plans to give us a quiz this Friday.
4. His father asked him to make full use of the winter vacation to perpare the entrance exam.
5. Computers play such an important role in the modern life that we can't work without them at all.
6. There is a tall memorial monument standing in the center of the square.是广场不是广播吧?