With so many people __in English every day, we can see it will be more and more important ___    a good knowledge of English．

 Entering the room, I found Mary _______ at the desk and _______ a letter.

A draft regulation on school bus safety management was made public by the State Council, with the public________to give comments.

He went out to play football, leaving his homework _________.

If _____ to look after luggage for someone else, inform the police at once.