Scientists say they have found a way to produce the human body’s own cancer-killing cells through gene treatment, ______ new hope to cancer sufferers.
--- Why did you play the music yesterday?--- Because it can old times.
The explorer got a disease in blood for the of fresh vegetables and fruit.
To achieve your goal, yourself and your direction the most important thing.
Scientists ______ thousands of chemicals before they decided on the right one in the end.
What Mr. White said sounds ______ .