keep it and clean

keep it and clean students,should,and,keep,clean,up,the,it,school,yard,clean It is our duty to keep our classroom clean and tidy.句中的 clean and tidy是什么成分?为什么? we must s______ the earth and keep it clean and beautiful I think it's our duty to keep our environment clean and tidy. It is our duty to keep our e___ clean and tidy Our teacher always tells us to keep sea water ______ and stop ______ it.(clean,pollute) Don't t_____ here and there.It's our duty to keep our school clean ilove shanghia.like sam and may.keep it clean.every day! We must keep the air clean and never _________ (pollute,polluting) it. It's a p____ way to help keep our city clean and tidy. please keep it clean.同义句 We keep our class clean and dirty It is our duty to keep our classroom clean and tidy.中的It《our duty 》和 clean and tidy是什么成分 It is my duty to keep my classroom clean and tidy it 是形式宾语还是形式主语 It's your duty__the classroom___.A to keep ,clean B to keep ,cleaningC keep,clean D for keeping ,clean It is nice and clean It is our duty to keep our classroom clean and tidy.这句话谁做主语谁做谓语