sad的副詞是

　　How sad that all his hard work should come to nothing.

　　他的所有辛勤勞動竟全部付諸東流，太讓人傷心了。

　　The increase in crime is a sad reflection on our society today.

　　犯罪的'增加令人遺憾地反映了當今社會不太好的一面。

　　It's a sad fact that many of those killed were children.

　　讓人難以接受的是遇難者中很多是孩子。