27. People have become aware ______the fact that carbon dioxide, poison to the environment, contributes_____ air pollution.
--Can you tell me why more and more people choose to shop in a supermarket?--Because it offers a great of goods.
The driver ________but he wasn’t wearing the seat belt.
I’m interested in ________ you have said.
Many people volunteered to donate blood; however, the blood bank needs ________.
________ I admit that all these problems are difficult, I don’t agree that they can’t be solved.