第三节：单句改错（每小题1分，满分5分）
在错的词下划一横线，在该行右边横线上写出改正后的词(每句均有一个错误)。
81. What the earth travels around the sun is known to us all. 81. _______
82. The ruler that he bought yesterday was lain on the table. 82.________
83. He returned in the afternoon of his birthday. 83. ________
84. He spoke too rapidly that we couldn’t clearly understand him. 84. _________
85. He shouldn’t have gone abroad, for I saw him in the part this morning. 85. _________