【简答题】To make a living, he tried ____and various other things, but he had failed in all. (write)
【单选题】All the money he had had been ____, so he had to make a living by begging.
【判断题】对小麦病毒病,目前主要依靠药剂进行防治。
【判断题】In 1993, he started to make a living working for Columbia University as a janitor.