While the book on the top shelf , you need to be very careful .
Some pre-school children go to a day-care center, ___ ___ they learn simple games and songs.
After graduation she reached a point in her career ___ ___ she had to decide what to do.
He was educated at the local high school, ___ ___ he went on to Beijing University.
We shouldn’t spent our money testing so many people, most of ___ __ are healthy.
Last week, only two people came to look at the house, ___ ___ wanted to buy it.