【正文】
road. It’s + adj +to do sth. helpful money to charities It is helpful to donate money to charities. It’s + adj +to do sth. fun voluntary work It is fun to do voluntary work. It’s + adj +to do sth. It’s important to take good care of the old. . 2. 學英語是有用的 . 3. 一小時內(nèi)完成這份工作是可能的 . 4. 上數(shù)學課是有趣的 . 5. 吃蔬菜是健康的