react ______…with… 以……对……作出反应
Chinese ______(定居者) came to Australia first in the nineteenth century.
He s______ his arm and hit me in the face.
Of course, natural scenery has always been an a______ for tourists.
The t______ of our discussion was “Europe in the 1990’s”.
We have taken effective measures to ______(保护) our natural resources.