Mr. Smith works in a machine factory. There he drives a truck (卡车). He’s busy all the time and can’t do any housework (家务). His wife is a doctor and likes to keep all the things tidy (整洁的，使整齐) and clean. She usually goes to work from Monday to Fri- day and has to do all the housework on Saturdays. All her friends know about it and sometimes they come to help her.
Last Saturday Mr. Smith had something to do and he left a lot of dirty clothes at home. Mrs. Smith didn’t go to work, but she was a little ill. So she didn’t want to do anything. After breakfast, Mary, one of her friends, came (来，出现) to see her when she was sitting on a chair.
The girl found (发现，找到；创办) rooms were dirty and asked, "Don’t you clean your room today, Mrs. Smith"
"No, I don’t." Said the doctor.
"Why don’t you wear glasses"
"This way I’ll think the rooms are tidy and clean]\
Last Saturday Mrs. Smith didn’t clean the rooms because______.