they are on a vacation ,这句话对吗

they are putting on a show are they on the they are having a good time on the playground .they _____ ____ _____ on the playground. Where are () quilts?They are on the sofa.A.they B.our 选哪个 为什么? They are _ the woods.They are _ the woods. A.in B.on C.at Are they going to have a picnic on( ) They are talking about______(go)on a school trip They are preparing_____(go) on a trip to Hainan Island They are going on a field trip的翻译是什么? The old men work on a farm,they are ( )(farm) They are on a cycling t ___ of the park They are excited______the party.A.at B.on C.after They are having a soccer m______ on the playground. They are going to a l_____ on sundays they are on a vacation ,这句话对吗 They are wearing a k___ of scarf on their heahs. They are a lot of magazines on the They are on your feet?