Many people think any government's work should be evaluated ______ on citizens' happiness level．

The tall building ____________ in the center of this area will be used as a 5-star hotel. 

Every student in our class had an application form in his hand，but no one knew which office ________.

 The site ________ now is an amusement park, which will be open to thepublic at the end of this year.

______ disturbed, I spent three hours locked in my room, preparing for the next day’s job interview.