| A．All right. | B．Oh, no. | C．No, he didn’t. |
| A．Thank you | B．I am sorry. | C．Class begins. |
| A．solving | B．solve | C．working |
| A．We | B．your | C．them |
| A．at; and | B．in; with | C．in; for |
| A．take | B．talk | C．took |
| A．on | B．by | C．at |
| A．Sam | B．Sam’s | C．your |
| A．isn’t | B．aren’t | C．are |
| A．is | B．are | C．isn’t |
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