-Why are you still here? Everybody has gone to attend the lecture by the president.
-Oh, I ____ about it!
A. didn’t inform B. hadn’t been informed
C. haven’t informed D. wasn’t informed
I don’t think David could have done such a stupid thing last night, ____?
A. did he B. didn’t he
C. do I D. don’t I
Measures must be taken to prevent pollution ____ happily.
A. from we live B. for us to live
C. us living D. from our living
. Lucy found one of her friends had been ____ after she finished the invitations to her wedding party.
A. taken out B. put out
C. picked out D. left out
As a famous public figure, you have a duty to ____ yourself responsibly, especially in public places.
A. carry B. conduct
C. guide D. operate
All the photographs in this book, ____ stated otherwise, date from the 1950s.
A. once B. until
C. unless D. if
