---I find ________ hard ________ me to understand his painting.---It’s polite ________ you to say so. His painting is nothing.
——Would you mind my opening the window? ——__________.
—— He didn’t catch the train, did he? ——__________, though he was caught in the rain.
—— Is Jim at home by himself? —— No, there is another boy __________ with him.
—— Where is your father? —— He has gone to the supermarket. He __________ at home.
—— What about having a rest? We have worked so long. —— OK. Stop__________,please. Let’s stop__________ some water.