【用括号里所给单词的正确形式填空1,mysonisn'tathomeandheisstudyingathis___（friend）home用括号里所给单词的正确形式填空1,mysonisn'tathomeandheisstudyingathis___（friend）home.2,icanhearsomeone】

　　用括号里所给单词的正确形式填空1,mysonisn'tathomeandheisstudyingathis___（friend）home

　　用括号里所给单词的正确形式填空

　　1,mysonisn'tathomeandheisstudyingathis___（friend）home.

　　2,icanhearsomeone___（sing）intheclassroom.

　　3,helookedoutofthewindowand___（shout）tosomechildren.