Using renewable energy sources is a simple idea, but ______ we find it hard to put into practice.
8.—Why were you absent yesterday? —I caught a cold,________I had been walking around in the rain.
7.The world body is committed to do__________it can to assist the people of Haiti suffering from the big earthquake.
6.If not_____ from work, I will spend some time________in my study every evening.
5.______the lack of a recent title, Ding Junhui can take comfort in knowing he has inspired a new generation of Chinese players.
4.Tom told me that after a few years in China not only____his Chinese, and that he had also obtained more interest.