Plans have been proposed ______ the largest dam in the world to be built along the Congo river.
Success always comes after many___________ ,in other words,___ is the mother of Success.
______we can’t get seems better than _______we have.
he can pass the entrance examination is quite uncertain.
When you are confused about some words in reading, you can ______ the dictionary.
It is no use ______ a lot without doing anything.