we are glad to see him 【wearing】 a smile on his face
我们很高兴见到他脸上挂着笑容

祝学习进步吴先生邀请我参加他们学校去世界公园的旅游Mr. Wu invited me _____ _____their school trip to the World Park.Mr. Wu invited me ___to__ __join___their school trip to the World Park.