ys, sending e-mails to each other has become a way _____ what they think to others.

The disc, digitally _________ in the studio, sounded fantastic at the party that night [ ]

Air pollution is getting more and more serious，so we must take action________it is too late.

George said that he would come to school to see me the next day, but he ______.[ ]

Lack of money ________ her not continuing her studies.