It is amazing that the little boy can go _______ the forest ________ 100 meter long.

The girl ___ in front of me kept laughing and crying.

When he       the door, he found his keys were nowhere.          

Last summer, I went back to my hometown,     the neighbors and the houses that I used to be familiar with were gone．

I don’t think it easy, even if we work hard,           the South Korea and the North Korea to sit down to talk at present.