Ⅰ. Complete the following sentences according to the meaning of the affixes.1. If they are co-producers, they produce something ____.2. What he said is illogical. Here illogical means ____ logical.3. An irregular verb is a verb which is ____ regular.4. He lived a hard life in pre-liberation days, that is, the days ____ liberation.5. They go to work by subway which means the railway ____ the ground.6. If the temperature is sub-zero, the temperature is ____ zero.7. A supermarket is a ____ self-service store selling food, household goods, etc.8. An anti-tank weapon is a weapon ____ tanks.9. Interstate trade is trade ____ states.10. A transatlantic trip is a trip that goes ____ the Atlantic Ocean.11. Supersonic speed is the speed which is ____ than the speed of sound.12. Postgraduate students are those who study ____ taking a first academic degree.13. A non-stop flight is a flight ____ a stop.14. A multi-storeyed building is a building which has ____ storeys.15. To disagree with somebody means ____ to agree with him.