We went to John's office yesterday. He behaved ______ he had not known us

(Complete the sentence with suitable words/phrase)

Jolly is my friend, she sing in a choir, but she used to gave it up for some unavoidable reasons. 

The world economy is passing through a great crisis due to war situation. The world leaders had better concentrate on the economy and security of the common people.

what does  a dinosaur  look like ? Have you ever seen it ?

We are waiting outside. As soon as you finish your dinner, don't delay to join us.

He is so honest that he would rather die than cheat.

What if the ice had cracked? You would have disappeared into the icy water.