用join，join in，attend或take part in的适当形式填空
【小题1】Why didn’t you ________ Mary’s wedding yesterday?
【小题2】He ________ the army in 1945.
【小题3】The students are going to ________ a lecture on AIDS this Sunday.
【小题4】Please ________ us ________ the discussion.
【小题5】Women are now ________ an active ____________ social activities.