He wandered from the subject．

My attention wandered．

We wandered for miles and miles in the mist．

The exchange rate of RMB against dollars is stable．No one can call back yesterday．

An exchange of opinions is helpful．

We’ll have an opportunity to exchange views tomorrow．

I’d like to exchange some pounds for dollars．

The old man and his wife have been used to living a simple life．

It was not half a year before the old couple got used to the life of London．

Small businesses are absorbed by big ones．

The old man was quite absorbed in the book．