I was disappointed with the lecture .I had expected ______to be much better .

----- The boys are not doing a good job at all, are they? ----_____ . 

___ seems enjoyable to you seems troublesome to me.

_________ needs further discussion whether we'll build a laboratory or not.

The American people will never forget the 9.11 event and the psychological trauma __________ caused to hundreds of thousands of common households.