We can take escalator to go upstairs in this supermarket. （ ）
| A．a | B．the | C．/ | D．an |
You can't drive into this way. It's one-way street. ( )
| A．an | B．the | C．a | D．/ |
He has ________ American stamp. It's very nice. （ ）
| A．a |
| B．an |
| C．the |
| D．／ |
There is ______ aviary in the park. There are many kinds of birds in ______ aviary. ( )
| A．a, the | B．an, an | C．an, the |
That is________ mountain. _____ mountain is high. ( )
| A．a, the | B．the, A | C．a , The |
