Mrs．Wang： Hello， Dr．Liu． This is Mrs． Wang speaking．
Dr．Liu： Hello， Mrs．Wang． （1） ？
Mrs．Wang：I' m worried， so I have some questions to ask you． As we know， these days many people have COVID﹣19．（2） ？
Dr．Liu ： First， we should exercise often to build us up． Second， （3） ．Third， we should wash hands often．
Mrs． Wang：（4） ？
Dr Liu： We must keep away from crowded people． We'd better not go to public places．
Mrs．Wang： Must we go to see a doctor at once when we have COVID﹣19？
Dr．Liu： Yes， we must．
Mrs．Wang： （5） ． Thank you!