He failed to_________ himself to the new environment.
| A．adapt | B．attach | C．adopt | D．advocate |
________ is no difference between them.
| A．There | B．Where | C．It | D．What |
_______ is no good _______ without doing anything.
| A．This, talking | B．It, to talk | C．It, talking | D．That, to talk |
________needs further discussion whether we’ll build a library or not.
| A．We | B．He | C．It | D．The thing |
He felt ______ to work for human rights and progress.
| A．it his duty | B．his duty | C．that is a duty | D．that is his duty |
______ will take you a lot of time to find him in the crowd.
| A．It | B．I | C．We | D．They |