---What is your mother doing? --- _________cooking dinner. A.she is B.He is C.She is
( ) These are . A. tigers B. tiger C.duck
( ) This is . A.beijing B. yunnan C Shanghai
( ) These ducks very naughty! A. is B .are C was
( ) Let’s the flowers. A. to water B. water C. watering
( ) What this? A.is B was C are