An unhappy childhood may have some negative effects on a person's character; however, they are not always __________.
As a teacher, I seldom give my students so difficult a problem_______ they can’t work out.
---Mum, I climbed to get the Teddy Bear from the top of the shelf.---My goodness! You _______ yourself. You _____ do that again next time.
The early pioneers had to many hardships to settle on the new land.
We believe ______ Beijing we’ll see in ______ year 2008 will be quite _____ different city from what it is now.
It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.