Plans have been proposed ______ the largest dam in the world to be built along the Congo river.
We will have modern equipment ______ things that are complicated. This will make things simple.
She was happy to devote herself _________gymnastics.
By the time she_____体操比赛上 at the New York Good Will Games, she_________ a dedicated junior gymnast for eleven years.
As Polly was riding on the train, she sensed that she was _____ by a tall man in a dark coat.
Over the long process of evolution, animals have developed their ______ senses, which makes it possible for them to _____ their environments.