rage of just 18.75cm of rain fell last year, making ______ the driest year since California became a state in 1850.

Heroes are those who，givena choice between doing the right thing at great personal cost or the wrongthing for great personal benefit，＿＿＿＿theformer

go to the New Year’s Eve party, shall we—- I guess it will be fun.

There is a teacher’s desk _______ the classroom. Mr. Liu is standing _______ it.

Recent research has____the natural mystery, which has amazed the world.