We ______ a School Show next month.
本题考查一般将来时的结构。句意：我们下个月准备举办一场校园展出。一般将来时的结构是“be going to +动词原形”或“will+动词原形”，故答案选C。
Look! The people on the beach are enjoying _______ very much.
本题考查enjoy oneself的固定搭配，先排除B和C项；再根据主语The people可知，与之搭配的反身代词是themselves，故选D。
The boys are looking forward _______ swimming tomorrow afternoon.
句意：那些男孩期待着明天下午去游泳。look forward to 表示“期待”，其后要跟动名词，故答案为B。