Fill in each blank with the approporiate form of the word given in the brackets. Living in the country is less _______ (expense) than living in the city. We need to reduce our ______ (depend) on oil as a source energy. The chairman emphasized his ideas by speaking more _______ (loud). Some American businessmen in China are spending a lot of time in ______ (learn) Chinese. Some people do believe that smoking will ______ (certain) cause lung cancer. I'm ______ (real) sorry for the mistake our office worker made last month. Her ______ (beautifu) had faded over the years. The sellers allowed us to pay them on a ______ (month) basis. It's ______ (danger) for women to walk alone at night. I was impressed by the ______ (deep)and complexity of the book.