Раскройте скобки, употребив глагол в нужной форме. Выберите правильную форму глагола Present Simple или Future Simple

1. If you reduce your price, we will place a big order with your company. 2. When the secretary types the letters, she will send them to the customers. 3. Our prices depend on the market situation. If it changes they will go up or down. 4. We will start deliveries as soon as we clear up delivery dates. 5. They will show the customer\'s representatives round the office when the chief engineer arrives. 6. We will go to the test department until you invite us. 7. Before you buy this equipment, you will study the terms of payment. 8. The engineers will get in touch with you as soon as they arrive in London. 9. If I need your help, I will ask you. 10. The contract will be valid after the director signs it.