Fill in the blanks using the appropriate form of present participle or past participle/ translate the sentences. 1. our engineer used the (recommended/recommending) method. 2. the heat (produced/producting) is equal to the work (done/doing) to produce it. 3. if (placed/placing) in different locality the weight of the body is different. 4. (testing/tested) this device the engineer wsed some new methods. 5. the device functioned all the time (using/wsed) the energy of the sun.