. Lily would never forget the evening ____ she lost the ring. A which B when C at which D where
Can those________at the back of the classroom hear me?
At the opening________of the school, our headmaster gave a short speech.
Sarah pretended to be cheerful,________nothing about the argument.
More highways have been built in China,________it much easier for people to travel from one place to another.
Our country will try to make greater progress in improving people's living conditions,________lowincome families.