is that your book?( ) a.that isn't b.

is that your book?( ) a.that isn't b.is that your book?( )a.that isn'tb.yes,it isc.it isn'td.no,it is( ).is this your ruler?a.excuse meb.sorryc.i'm sorryd.helloa:your watch is very nice.b:( ).a.no.it isn'tb.yesc.thank youd.sorryis that ( )english dictionary?no,it 's( ) chinese one.a.a,ab.an,anc.a,and.an,a