while my sister （is） having her maths lesson.填is还是are

while my sister （is） having her maths lesson.填is还是are my sister is very thin while I am very fat.为什么用while, （this）is my sister My sister is（ ）years old. she is my sister. My sister is a my sister is a My sister is a my sister is my sister is my sister is zhangjing is my sister. Her sister is twelve.So is my sister（合并）Her sister is ____ ____ ____ ____my sister My parents'?is my sister? she is my sister (对括号部分提问) 有急用!she is my （sister ） My sister is eight years old（改为同义句）My sister is _____ ______ girl My sister is an office worker.（作同义句）1.My sister （ ） （ ） （ ） （ ）.2.My sister ( ) ( ) ( ) . My brother is taller than my sister.(保持愿意）