____ of time and energy have been spent in making the earthquake-stricken areas a permanent museum to remind people how disastrous a natural disaster can be. 

 In fact, the renovation is just one move in a huge project to improve Chinese teachers’ housing ______ in recent years.

“Freeze, you guy! ________, and I’ll shoot you.” an old man with a gun in hand shouted at me.

Don’t be in a hurry. We are supposed ____________ this problem step by step.

My first ________ of him was that he was a kind and thoughtful young man.