We are advised to work with more than one program ______ we have to use them at work.

The boys got lost in the street,so they______the map.

He has called several times this morning _______, there is something very urgent

This is a busy port with so many ships _____every day.[ ]

It is very kind ______ you to help me with my lessonsbecause it is very difficult ______me to learn them well.