11. It is because people are likely to stay indoors ______ the virus can spread easily ______ people often catch colds.
29. The film is ______ a film. It is also a good material for education.
28. The water will be further polluted unless some measures ______.
27. More and more Chinese women are having difficulty ______ Mr. Right or are choosing the single life.
26. He returned home very late as ______.
25. As soon as I got home, my father asked ______ with me.