| A．us | B．I | C．he |
| A．Let me clean the windows. | B．Let's clean the windows. |
| A．Thank you | B．OK |
| A．door | B．window | C．clean |
| A．Bye, Mr Black！ | B．OK！ |
| A．It’s so big. | B．It’s so nice. | C．It’s so beautiful. |
| A．Let’s clean the blackboard. |
| B．Let’s clean the classroom. |
| C．Let me clean the classroom. |
（
（
（
（
（A．I like my class.  | B．The classroom is so big. |
( )| A．door | B．floor |
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