23．A brilliant idea occurred to him, ________ to his research in the lab．
A．while devoting B．while devoting himself
C．while he was devoted D．while devoted
24．The newspapers in my hometown don’t contain as many colorful pages as the ones in Nanjing ____．
A．contain B．do C．appear D．seem
25．-You won’t go to Mary’s birthday party, will you?
-Yes, ______ I’m invited．
A．even if B．unless C．if D．though
26．--- I think this accident happened for many reasons．
--- Richard is partly to blame, _______ w ay you look at it．
A．what B．which C．whatever D．whichever
