_____from the moon ,our earth with water ____70% of its surface, appears as a “blue ball”
___on the fast train heading northeast from Nanchang and five hours later you will hit Jingdezhen.
-- Who do you think ___ the book here? --- It may be John. He was sitting here all the morning.
We met an old friend in New York ____our expectation. She waved at us ____ the street when she saw us.
Three years had gone by ____ he came to realize what a fool he was not to listen to the teachers !
To finish the homework, he spent four hours _______ in the study.