Помогите пожалуйста
Open the brackets and make Participle II of the verb.1. The question (concern) is very essential. 2. When (study) thoroughly, the catalogue seems to be complete. 3. Here you can buy everything (make) in this country. 4. The message (leave) for me was rather important. 5. If (publish) in time, the article could be of great help. 6. The equipment (offer) was of high quality. 7. The agreement (achieve) was important. 8. The contract (sign) two days ago was mutually beneficial.