____the letter, he went out to post it,
A situation often appears where we know what a word means and how to read it but it has _____ our minds when we want to write it down.
---What a prosperous city your hometown is!---Yes. _____ used to be a small village many years ago has developed into a modern city.
---What about the details of the agreement?---There is no hurry. I _____ a meeting in the sales department and then I’ll tell you.
The stretches of mountains are the natural _____ between the two countries.
—Look! So many people are gathering before the store.—_______ They are waiting to buy an iPhone6.They are really iPhone fans.