1.It （没有区别）since we have known the result.2.Do you know（他如此不开心的原因）？3.He was told（不要在河边玩耍）.4.It （我花费了一小时完成） the homework given by our English teacher.5.She wants to make it clear（会议是否被推迟）.6.He （看起来像）his father.7.（浏览）this book and tell me what you think of it.8.He is the student（他的父亲是我的老师）.9.It is polite（你这样说）.10.He is unhappy，（我也是）.11.He is（盼望）hearing from his mother.12.Can you tell me（我怎样能到广州）?13.When he heard the bad news，he （忍不住哭了）.14.Is this the park（他三年前去过的）?15.You will enjoy（学习使用新电脑）.