Not until he walked into the classroom　　　that he left his dictionary at home.

　　　from the tenth floor when the policeman pointed his gun at him.

(2013·淮安模拟)—I’m really depressed after so many failures. I can’t see any hope.
—Cheer up! Behind every misfortune　　　!

Only when you are living in a foreign country　　　the importance of English.

　　　, the farmer continued working in the field.

Only after one has become a parent _____ how great his parents are．

_____ is well known to the world is that China has very top technology in space industry．

Lee MinHo, _____ music and films are loved by many teenagers, was invited to perform in the 2014 Spring Festival．

I wonder _______ there are so many natural disasters across the world in 2010.

Into the dark apartment _______, who was quite surprised when everyone shouted “Happy Birthday”.