Fill in each of the blanks in the following sentences with a suitable preposition or adverb. 1. The doctor did not tell the family that Tom would be likely to suffer _______ heart disease for fear of frightening them. 2. People all over the world should be concerned ________ drug and pollution ( 污染 ) problems. 3. When the girl asked them if she could ask her boyfriend __ ____, her parents gave her a negative answer. 4. After losing touch ________ his younger sister for twenty years, Brown was amazed to find that they were both living in the same state. 5. We are confident that our city will take ______ a new look in the 21st century. 6. All the people landed _______ her and her face turned red. 7. The words on the sign are so large that we can see them _____ a distance. 8. When the clouds moved in, the moon was no longer ______ sight. 4.