Is he honest? I find ____ hard to believe what he said.

All the other boys have geography books and they will be ahead of me if I don’t get ______.

I had to buy ________ these books because I didn't know which one was the best.

---When shall I call you, morning or afternoon? ---________ is OK. I will be free all day.

In winter, the weather of Moscow is ______ colder than _______of Beijing.