9. The boy was naughty and he used to       (弓I起) so many troubles.

8. He spent a day studying the       (龐大的) machine.

7. He spent one       (第五) of his money on the project.

6. It took them more than two        (十億) dollars to finish the project.

5. Li Ming is preparing some       (筆記) for his homework.

4. He is reading a       (報告) of the state of H7N9.

3. The water level is        (上升;增長) day by day.

2. This classroom can       (容納) fifty students.

1. This city has a       (人口) of more than 10,000,000.

6. It's too       (noise) . Let's find a quiet place to learn.