You don’t need to explain so much about this theory to Peter. _______ , he is clever enough to understand it .
With the boy______ the way, we had no difficulty ______the village.
She to beat the world record but failed at last.
Eating too much fat can ________ health problems,so we must have a balanced diet.
It is in their ability to speak ________ humans ________ from animals.
The engine of the ship was out of order and the bad weather________ the helplessness of the crew at sea.