．--- Wow, so many new houses! I can’t believe that. It used to be a poor village. --- Yes._____has changed here.

It’s a little surprising that a house made of wood or bamboo may stay up in an earthquake while _______ made of steel and concrete may fall down.

—All the volunteers were very tired, but            of them took a rest.—They were busy looking for the missing people.

--- When shall we go to West Slender Lake, this afternoon or tomorrow morning?--- ______ is OK. I’m free these days.

Knowledge from real life isn't easier to forget than ___ achieved from textbooks．