We were about to start out________ our friends called us up from Shanghai

Father advised me not to say anything until＿＿＿＿＿ at the meeting.

When_________ your English teacher _________ his hometown— He_________ for nearly two months.

I’m afraid the headmaster is _________ busyto meet the visitors.

derstandings ________ from lack of social communication, unless ________ properly, may lead to serious problems.