Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
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Heleftordersthatnothing_____toucheduntilthepolicearrivedthere.
ProfessorJohnsonissaid_____somesignificantadvanceinhisresearchinthepastyears.
Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
.IfyouhavereallybeenstudyingEnglishforsolong,it’sabouttimeyou_____abletowritelettersinEnglish.