They hurried to the train station, it was too late. They had to wait another ten minutes.
. I wonder how he could __________ not handing in his maths exercises yesterday, for his maths teacher is always strict with his students.
. She was educated at Beijing University, __________ she went on to have her advanced study abroad.
. --- Can you read the sign , sir ? No smoking is allowed in the lift ! --- __________.
. Tom is reading a book __________ his brother is watching TV.
. My uncle __________ until he was forty-five.