Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.
Zhang Hong is said___________by heart 2000 words up to now .
They really have a great time too , designing everything , drawing the blue prints , ___________the angles and so on .
—Was it in 1969___________the American astronaut succeeded___________landing on the moon ? —Yes , that’s right .
.—Who did you stay with ? —___________.
—What about the books ? —Books of this kind well .