1.The population density per square mile in the United States is twenty-two people,_______________ . while that in Canada is two

　　2. The computer being a useful tool in serving the people, we should do our best . to have a good command/ mastery of the computer science

　　3. Thompson had a hard time (適應氣候風俗)in the new country. getting used to the climate and customs / adapting himself to the climate and customs

　　4. It was a small country house but it was large . by urban standards

　　5. You ;our teacher only asked for 300 words, and you have written 400! neednt have written such a long essay