There is ’s’ and ’u’ in the word’ understand!
| A．a; a | B．an; a |
| C．a; an | D．an; an |
He felt curious that he asked many questions about it.
| A．such , such | B．so , so | C．such , so | D．so , such |
My cousin, Jack prefers tea sugar.
| A．in | B．with | C．to | D．on |
-----will your father be back from work?
-----In half an hour.
| A．How long | B．How soon | C．when | D．How often |
It’s necessary us English well.
| A．for , to learn | B．for , learning |
| C．of , learning | D．of , to learn |
18-year-old girl called Anna from England visited Great Wall last Friday .
| A．An, the, the | B．A ,／, the | C．An,／, the | D．A, an , a |