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

 --- Oh, no .Where is my purse ? --- Don’t worry .I saw _______ black one in the drawer .Is it yours ?

 ----______ will they finish printing the newspaper?  ----In about five hours.

— Have you got the __________news about the World Cup?— Yes, I’m so ______ because  my favourite team  has won  again.

I heard that we must have _________ teaching building __________ .