. Not until the train pulled into the next station ______ her suitcase gone.
Liu Yang is ________ first woman astronaut in China who reached ________ space.
According to ________ People's Daily article, 40% of the lakes in Jiangsu have dried up in ________ past 30 years.
The actress received an award for her ________ to charity work.
We need an effective strategy to help children living in ________ poverty to have the opportunity to receive ________ good education.
—What does PM2.5 mean?—It's a professional ________ indicating the condition of air pollution.