Madame Curie(居里夫人) contributed all his life ______ radium(镭) so that she has earned respect from people all over the world.

Tommy is honest boy. He has useful tool.

Professor Williams keeps telling his students that the futureto the well educated. [ ]

The way ________ the problem sounds reasonable[ ]

Which colour do you_________, red or purple—- Red. I think it looks lovely _________ me.