1Youshouldknockatthe的精選

問題詳情：根據句意及漢語提示寫出單詞 （每空限一詞）1.Youshouldknockatthedoorbeforeyou________________(進入)theroom.2.Duringthe_______________(二十)century,mobilephonesbecomepopularallovertheworld._________...