选出错误项并改正（5%）
(     )____________ Lucy forgot her homeworkat home yesterday.             
A         B    C       D
(     )____________ The gravity on Mars is about third-eights of that on Earth.           
A      B        C         D
(     )____________My sister prefersto wear black to red.
A        B      C         D
(     )____________ He was too tired that he couldn’t keep his eyes open.
A              B       C      D
(     )__________Since her mum is busy, Mary oughts to do more housework.
A             B         C        D