1. Though he started to learn to operate the machine as recently as last month, he can work ____________________ .

　　2. He worked very hard, but ____________________ .

　　3. Before he left for Shanghai, ____________________ .

　　4. He wrote to his friends, saying that ____________________ .

　　参考答案：

　　1 as fast as a skilled worker now

　　2 couldnt perform as well as his parents had expected

　　3 he promised that he would go and see his grandparents as often as he could

　　4 after finishing his studies abroad he would come back as soon as possible