As a young man , he’d rather have a room of his own, however small it is, than __ a room with someone else．

Victor apologized for ________ to inform me of the change in the plan.

_____such heavy pollution already, it may now be too late to clean up the river. 

With his mother_______ him, he is getting on well with his work.

Tom kept quiet about the accident　　　 lose his job.