I was        in the middle of my call because I had no more coins to put in the box.

When he realized the police had seen him, the man_____the exit as quickly as possible.

After long and hard struggle, his small family business began to _____.  Hopefully, it will change into a large firm in the near future.

It is nice to see millions who had nothing but a record of misery and hungry ______ to improve their life and living conditions.

Sometimes we should      roles so that we can understand each other’s difficulties, thus promoting our cooperation.