Elephants have their own way to tell the shape of an object and ________ it is rough or smooth.     

It is a long time _______they separated, but it won’t be long ____ they meet again.

 When he was a little boy，he ______ on the farm.

With the world economy growing weaker, for many young people, the dream of landing a good job is becoming harder and harder ________.

---_________ she can’t find her keys? She’ll be locked out all night.---You are right. I’d better call her to check if she’s OK.