Jimmy is _________one-year-old boy and he has_________8-year-old sister.
| A.an, an | B.an, a | C.a, an | D.a, a |
—Jane ,can you play_______ erhu .
This is ______ useful book on erhu .
A. the , a B. / ; a C. the ; an
This is ______ useful book on erhu .
A. the , a B. / ; a C. the ; an