when we put on them,they are full.but they are empty when we dont use them.what are they?

when we put on them,they are full.but they are empty when we dont use them.what are they? 用英语回答when we put on them,they are full.but they are empty when we don't use them.接上what are they? put them on还是put on them We put _ on the table.A.it B.them put them away ,put them up ,put them on ,put them downput them away ,put them up ,put them on ,put them down分别是啥意思 put them on in strange 首字母填空Cars are lots of Cars are lots of fun,but they could also ba dangerous.We have to be c___ when we drive them or ride in them.It's always a good i____to put on your seat belt when youre in a car.Why?Think about this example :You put an we (-------)the date when we are leavingA.decide on B.depend on C.look on D.put on Put them for Paris (on Thursday).用when对（）部分提问 ----Whose ______ (brush) are these?----They’re ______(we).Please ______ (put) them on the desk. ----Whose ______ (brush) are these?----They’re ______(we).Please ______ (put) them on the desk. We （ ）our coats and put them on the back wall. 翻译:the pens shouldn't be on the floor.we should put them. 初中以上学历回答我的英语题,拜托!1.When we put on them, they are full.But they are empty when we don't use them.What are they?2.What is the difference between a hill and a pill?3.(句型转换)Let me look at your new English book.Let et _____clothes on lamps or heaters when we aren't here.A.Not put B.Don't put C.Doesn't put D.No put put down 和take down 的意思when the picture was (),we put up a photo on the wall to put on eggs to hatch them How many inches too short were the trousers when the young man finally put them on?这句话如何翻译?