—Jane ,can you play_______ erhu .This is ______ useful book on erhu .A. the , a B. / ; a C. the ; an
—________do they go to the park? —Because they want to play games there.
—Let’s go to the zoo on Sunday morning. —________.
The________often cat grass on the hill.
You can see an________in the zoo.
—I think recycling books and paper is useful. —________