1. After that, we took part in some activities.

　　2. And you must be prepared to work very hard!

　　3. Based on her description, scientists regarded it as a kind of sea dinosaur.

　　4. By midnight, the square was empty except for the giant horse.

　　5. Computer languages are not spoken languages but written languages.

　　6. Congratulations, everyone!

　　7. I want to make a complaint about the air conditioner

　　8. For example, people throw as many as seven billion drink cans in the UK every year.

　　9. They can communicant with each other on Internet.

　　10. For the time being ,nobody is unaware of the answer to the question.