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

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• 用英语回答when we put on them,they are full.but they are empty when we don't use them.
• 单词拼写答案：1 Most people like to use this piece of music as b( ) during the break2 When I reached school yesterday,the class had already b( )3 There's d( ) in front.A big hole,you see?4 We are c( )empty bottles to raise money for poor kids.5 Mom t( ) me to ba an honest boy all the time6 Put your h( ) into study,and you'll experience the joy of it7 The book is really h( ) so that I pass the exam finally
• 英语句型转换题.21、You should put them back after you use them.（变为简单句）You should put them back _____ _____ them.2、We all expect him to come to the party.（变为复合句）We all expect _____ _____ _____ come to the party.3、We can't decide where to go.（变为复合句）We can't decide _____ _____ _____ go.4、Please tell me when to leave for the front.（变为复合句）Please tell me _____ we _____ leave for the front.5、Now I will show you how to do the work.（变为复合句）Now I will show you _____ ___
• 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?
• 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?
• at school / at home为什么不加定冠词The?另外,有那些常见的介词用法?at a factory这个更郁闷，为啥要定冠词a?这种如果我说错，比如说 at the school / at factory（或at the factory）会有问题吗？