Замените определительные придаточные предложения оборотом с причастием I. 1. When I

Поменяйте определительные придаточные предложения оборотом с причастием I. 1. When I travel I always reserve accommodation in advance.2. We are going to contact the firm which is advertising the latest modal of the boilers. 3. When the director came into the office he saw several people who were waiting for him.4. When we write a cable we try to use as few words as possible.