Task 1 Fill in the blanks with the right words or phrases. Change the form where necessary. crucial practical effective productive desire choose guide maintain depend on ensure 1. The agreements will be __________ from December. 2. Your invention is clever, but not ____________. 3. Some good books can __________ you through your whole life. 4. Glass can easily be shaped into any __________ forms. 5. They can __________ freely from a wide range of courses. 6. Temperature is a __________ factor in successful fruit storage. 7. The two countries ______________ friendly relations for many years. 8. This medicine will __________ you a good night's sleep. 9. She is a __________ writer and has written many successful novels. 10. Whether the game will be played __________ the weather.