(1)He’ll ________ an important meeting tomorrow．(他明天要参加一个重要会议。)
(2)Come along and ________ the ball game．(快，来参加球赛。)
(3)Will you ________ us in the discussion?(你参加我们的讨论吗？)
(4)We often ________ physical labour．(我们常参加体力劳动。)

参考答案：(1)attend　(2)join in　(3)join　(4)take part in