80.I　couldn’t get　　　　 (接通).　The　line　was　busy .

79.People try to avoid public transportation 　　　(耽搁) by using their own cars, and this in turn　creates further problems .

78.I　don't　want　to sound like　I'　m　speaking　ill　of　anybody,　but　the　manager'　s　plan　is　　　　 (不公平).

77.He didn't know his friend's marriage was in serious 　　　(窘境)until he appeared one night asking if he could sleep on the sofa .

76.Each of us was afraid of looking very 　　　　(笨的) .