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 ____________________ .

　　翻譯解析：

　　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