Most companies’ marketing effort is focused on getting customers, with little attention _______ to keeping them.

With his eyes ________ the work attentively, he didn’t know what was happening outside.

John received an invitation to dinner, and with his work ________, he gladly accepted it.

My birthday ________next week, I’m busy preparing for a big birthday party, planning to invite all my best friends.

I climbed the stairs slowly with a big suitcase, my father        with two more.

The girl in the photo was smiling sweetly, _____.

He wondered if he could slip out of the lecture hall without anyone _____.

With the school rules _____ by the students, the school has taken on a new look.

_____the problem of land erosion getting more serious, the government is searching for a way to deal with it.   

_____the problem of land erosion getting more serious, the government is searching for a way to deal with it.