Point out the mistakes in the following sentences from the perspective of official language and correct them. Thank you.

1. This work of our bureau has been strongly supported by your company, and I would like to express my deep gratitude to your company.

The previous stage paid too much attention to production and neglected the concern for safety.

According to incomplete statistics, about one third of the young people in our company have the spirit of ownership.

4. The Beijing Municipal People's Government has formulated the Provisions on Hanging Slogans to Celebrate Festivals, which the General Office of the State Council thinks can be used for reference by all localities, and issued a document for this purpose. Issued by the State Council General Office.

5. The people's government of a certain district and the traffic police brigade of the district jointly wrote an article entitled "Notice on Strengthening the Publicity and Inspection of Safe Driving in Winter".