用what/that/how/whether/whoever/whose/where/which填空 He gave us a vivid description of he had seen in Africa. The only way to avoid being miserable is not to have enough leisure to wonder you are happy or not. I looked around and was not certain house I was in. The students here will give their used books to need them in the countryside schools. The situation today is obviously different from it was only 50 years ago. Persistent people begin their success others end in failure. I didn't realize difficult it was to get the tickets for the performance. You say you are brave. Now let's see of us is the more timid. I know nothing about her except she is an English teacher in our school. We all thought it a pity the sports meet should have been put off.