---What _____ useful book! And ______ book is popular with students.A. a, a B. a, the C. the , the
—What’s this in English? ---It’s a CD.____CD is blue. A.a B. An C.The D.\
Have a look ________ my white shoes.
We can _____books ___ the bookstore。
How much are these shoes? _________ twenty dollars.
Let Tom _________ now.