---It’s difficult for the villagers to cross the river. ---I think a bridge______ over the river.
There are over twenty ________ visitors visiting the park.
He is getting ________ to hear the ________ words.
This problem is ________ that one.
________ animals are in danger and there will be ________ space for them if we don’t take any actions.
We know the boy ______.He likes the music________.