| A．going | B．to go | C．go |
| A．Yes, he is. |
| B．Yes, he goes by bus. |
| C．Yes, he does. |
| A．I am going hiking | B．I play basketball | C．I read books |
| A．ran | B．runs | C．is running |
| A．on; on | B．at; in |
| C．at; on |
| A．fly to fly | B．flying to fly | C．flying flying |
| A．are | B．is | C．has | D．Have |
| A．has changed | B．is changed |
| C．is changing | D．changed |
| A．an; a | B．a; a | C．an; an | D．a; an |
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