从a、b、c、d四个选项中，选出可以填入空白处的最佳选项。 1. we feel _________ our duty to make our country a better place. a it b. this c. that d. one 2. —just a moment. i haven't finished packing my suitcase. —_________. its high time we left for the airport. a. go ahead b. take it easy c. hurry upd. that's fine
