————this your library?Yes,it is空格处填am is are

————this your library?Yes,it is空格处填am is are Is your pen?—Yes,it is.不能用Yes,this is. Are these your trousers?—Yes,___.A.it is B.they are C.they'r —Is this coat _____? —Yes,it's _____. A.yours;mine B.your;my —Is（ ）your sister?—Yes,( ) is.A.this;he B.that;it C.she;it D Is it your telephone?—Yes,it’s ______(l) —Cindy,is this your backpack?—Yes,t____ you. Is this gutar your Yes,it is( ) Is this your book?Yes,it is ——Excuse me,where's the museum?Is it the library?——Yes,they Is this your sister?Yes ,----填it is还是she is 英文问：Is this your first name?Yes,(应该是I am还是it is)