— Do you have to take care of your mother at home ? — Yes , I ____ .
. 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.
Whether ways will be found to help China _______ the current world financial crisis is just _______ worries the public.