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

I tried hard to get some information about the new technology out of his mouth,but he remained __________.

The __________look on his face suggested that he _________________so.

------How are you getting on with your roommates?--------______. I’ve got to know them all.

(2014·苏锡常镇四市调研)—How was your interview for going abroad to study?—Oh，I couldn’t feel any________.I hardly understood most of the questions they asked.