We all feel it is Jack as well as his wife that ____ for their son’s bad behaviour at school. [ ]

When did you come back—Half an hour ago. You ____ to music.

It was considerate _____ you not to playthe piano while I was asleep.

I left my handbag on the train, but luckily someone gave it to a railway official.—How unbelievable to get it back! I mean, someone ________ it.(2011·江苏)

There’s ________ one-legged desk in ________ classroom.