A person who has never tasted bitter won’t know ______ sweet is.
—You've made great progress in your studies of English, haven't you?—Yes, but much______.
______ is known to us all is that China has launched Shenzhou V spaceship successfully.
He hasn't come yet. What do you consider ______to him?
It was ______ great shock to the world that two airplanes crashed into ______ World Trade Centre in New York on Sept. 11.
The government has devoted a larger slice of its national____________to agriculture than most other countries.