________ we know, the moon goes around the sun.
After several days of social activities, I decided to _ on my research on the human behaviors.
I came to the music hall, I got addicted to the tone.
you wouldn’t like to go there, you’d stay where you are.
–Why don’t you stay at the Baotuquan Hotel? --You ! Do you know how expensive that place is?
While he in Europe, he some photographs of many universities.