David is a skillful worker. I’m sure he has enough _______ to fix all the electronic ______.
The storm is moving slowly____________.
. He made up his mind to devote his life____________the river____________polluted.
. Many people think that it is ____________making such an experiment.
. One day I ____________a newspaper article about one in six European mammal species threatened with extinction.
. We can catch____________ sight of millions of stars in____________space.