Task 4 词形变换 1. Living in the country is less expensive (expense)____________ than living in the city. 2. We need to reduce our (depend)_______________ on oil as a source energy. 3. The chairman emphasized his ideas by speaking more (loud)____________. 4. Some American businessmen in China are spending a lot of time in (learn) _____________Chinese. 5. Some people do believe that smoking will (certain) ______________cause lung cancer. 6. I’m (real)______________ sorry for the mistake our office worker made last month. 7. Her (beautiful)______________ had faded over the years. 8. The sellers allowed us to pay them on a (month)______________ basis. 9. It’s (danger) ______________for women to walk alone at night. 10. I was impressed by the (deep)______________ and complexity of the book.