根据句意和汉语注释，在答题卡对应题号的横线上，写出单词的正确形式。
【小题1】Students have to reach a certain_________(标准) or they won't pass.
【小题2】The singers ________ (成功地) mixed Chinese traditional music and modern Western music.
【小题3】___________(非洲人) prefer to invite friends to their homes to celebrate festivals.
【小题4】Last month we played volleyball ___________ (对抗) a team from No.9 Middle School.