.He said that not until the heavy snow blocked the express ______ how serious the weather was.

-- I didn’t go to Mary’s party last night because my car broke down. ---You could have borrowed mine. I ____ it.

Dream of the Red Chamber is _____ worth _____ because we can learn a lot about the noble families in the feudal society. 

It is often ____ that human beings are naturally equipped to speak. 

I hope that my father will quit smoking because I want him to live__________ my grandpa does.