The Acropolis was constructed in the 5th century BC ______ a high altitude above the city _____ Athena, the goddess of Athena.
I was ________ at the letter, which was _________ to my classmates..
---So you made it? ---Yes. It was so dark that we managed to avoid ________.
Chengdu has _______traffic that all the schools in it had a day off on the first day of the Western China International Economy and Trade Fair (西博会)to avoid traffic jams.
To her joy, Della earned first the trust of her students and then _______of her colleagues.
If we _______ now to protect the environment, we'll live to regret it.