-______are you so happy, Daniel?-Because it’s my birthday today.

 -Before I enter the competition, I want to know the __________.-The winner can get a gold medal.

I used to ___________ in the country. But now I am used to ___________ in the city. 

I can tell the stories, _________ I can’t write the stories. 

At the top of the high mountains, there is very _____ oxygen in the air.