12. I tried aerobics (有氧运动) but it was too ________ for me.

11. Most British schools organize ________ events for the students.

10. The country’s economy is mainly ________ and depends on crops like coffee.

9. Those workers worked ________ to finish the task.

8. He behaved ________ he hadn’t known anything about it.

7. I’m ________ hearing from you.

6. The government set up a monument ________ the heroes who died in the war.

5. It’s acceptable to ________ your friends on April 1st.

4. Luckily, help arrived ________ a police officer.

3. I hate the smell of paint when I’m ________.