Предложений с инфинитивом в функции подлежащего и обстоятельства цели. Предложения переведите

1) To increase labour productivity we must use material resources rationally. 2) To achieve successful results of the experiment was the main task of the scientist. 3) To build a new railway station line in the desert region in such a short time was a very complicated task. 4) To make their national currency convertible they need to know its exact purchasing power. 5) To sign the agreement worked out by the company’s lawyers is a new stage in the development of our cooperation. 6) To make maximum profits enterprises should save energy and raw materials. 7) To call for a conference on tariffs means making a progressive step toward solving international disputes. 8) To spend more than 50 million dollars for new equipment would be more useful.