( )| A．We often go to the park by bus. | B．We often go to the park by subway. |
( )| A．Alice usually goes to school on foot. |
| B．Alice often goes to school by bus. |
| A．a; the | B．the; a | C．不填; a | D．a; 不填 |
| A．on foot | B．by bus | C．at school |
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