we are glad to see him w------ a smile on his face

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
再问： 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.
再答： Mr. Wu invited me ___to__ __join___ their school trip to the World Park.