83. Hot dogs are not so delicious as sandwiches.

　Hot dogs are _________ delicious _________ sandwiches.

82. This is the most interesting story that I have ever heard of.

　I have _________ heard of _________ an interesting story before.

81. If you play basketball here, you may break the windows.

　_________ play basketball here, _________ you may break the windows.

80. They knew something about it only after you told them.

　They knew _________ about it _________ you told them.

79. The girl left her home a few days ago. She has not come back yet.

　The girl has _________ _________ from her home for a few days.

78. There are green trees on either side of the street.

　There are green trees on _________ _________ of the street.

77. Can you show me the way to the post office?

　Can you tell me _________ _________ get to the post office?

76. They say that Mr Liu can speak German.

　_________ _________ that Mr Liu can speak German.

3． 同义句转换，每空一词(含缩写)。

75. They came to ask for help.

　_________ did they come _________?