The special dance，Gangnam Style，is ________ popular all over the world and was even performed in the White House.

One should remain ______ and think of ways to escape when facing danger.

----- I am certain David has told you his business troubles. ----- ______, it is no secret that he owes a lot of money to the bank. 

---You  aren’t  looking  well. Anything the matter?---I’ve  been  surfing the net too long. I’m a bit tired.I can hold on,____.

I  , but my mother didn’t   .