Johnson had made up his mind to give it up, but on ________ second thought he determined to try ________ third time.
8. I didn’t see your sister at the cinema. If she ______, she would have met my brother.
9. _____ all behavior is learned behavior is a basic assumption of social scientists.
10. By the middle of the 21st century , the vast majority of the world’s population ________ in cities rather than in the country.
11. It is because people are likely to stay indoors ______ the virus can spread easily ______ people often catch colds.
12. He gave us a nod and muttered a “yes” after _______ seemed like hours.