Tom, clean up the broken glass _________ someone walks on it.
________________, the experiment is sure to succeed.
When I woke up, I found myself ______ in bed and _______ by doctors and nurses.
Because he was _____ the new limit, he was stopped by traffic police and was fined 200 yuan.
All the old paintings were well-preserved when they were discovered by the farmer.The underlined part means _______.
______the students didn’t hear what the teacher said. Some of them were absent-minded .