用ever,already,just,never,yet,before等词填空

用ever,already,just,never,yet,before等词填空1、-Have you ______ been to the space station?-NO,I have ______ been there2、-Havedone your homework ______?-Yes,I have.I have ______ done it.3、I havebeen in China for two years _____.4、My brother has _______ seen an interesting place_______.10、His parents have ________ gone to paris,so he is ai home alone.