The oceans and seas ______ the islands are more or less polluted.

_____ more effectively with others, more and more people equip themselves with a    higher education. 

_____ to sunlight for too much time, as the doctors say, will do harm to one’s skin.

 ________ in 1963, and ________ in Philadelphia, Charles Pettigrew so impressed his teachers that he was sent to Barklee School to study Jazz. 

The mother didn't know who ________ for the broken glass as it happened.