we had just taken our seats ,then comes the chairman

we had just taken our seats ,then comes the chairman They had just taken their seats ,then_.A the chairman came B we didn't find our seats till the play had begun.till能换成befo We had a _journey during the long holiday.(please) Chairman .Shall we request the chairman __________ our suggestion aga we just had to show our passports and they let us get on the 21.You _____ wash the clothes,for we have just had our washi If we had taken his advice,the project _sooner. The villagers had many trees ___ ( plant ) just then . the meeting( )if the chairman had come. The bell rings and we go back to our seats的意思是? the construction for which had taken more then three years.为