Upon reaching an/a ______  age, children are encouraged, but not forced, to “leave the nest”.  

The schoolboy,still in bed,said to himself,It’s cold outside,and my bed is __________ and warm.

Of all the __________ entertaining TV programs nationwide, So You Think You Can Dance on Shanghai Dragon TV is my favorite. I’ll definitely tune in on Sunday evening.

 --What do you think of the Prime Minister’s address to the nation? --I like________of what he said.

How exciting this football match is!Have you ever watched________ one?