我们很有必要了解下如何预防它。
________________________________________________
我确信所有的病人在医院能得到很好的照顾。
________________________________________________
到目前为止上万人得了这种疾病。
________________________________________________
—Did Marie Curie discover radium?
—Yes. She is a great scientist, and devoted ________ to science.
—Why is Lucy so excited these days?
—Because she is looking forward to ________ the hill at the spring outing.
—You look so sad today.
—I passed my physics exam, but ________ chemistry.
