Although his experiments were designed to support the ideas       the influence of environment upon plants, Mendel found that many characteristics were passed on from one generation to the next.

Everybody showed great respect to the old doctor, who devoted everything he had to __________ the poor conditions of the local hospital. 

 The engine _______ smoke and steam. 

Don’t ______ a trick on the little girl. She is very shy.

The rise in wood fuel(燃料) use has __________ the disappearance of forest and the loss of habitats for pandas..