| A．All right. | B．Let me help you. | C．Please help me. |
| A．Let’s clean the blackboard. | B．Let me clean the blackboard. |
| A．How are you? | B．Excuse me. | C．I’m sorry. |
| A．Thank you. | B．It’s OK. | C．You’re right. |
(window / computer).
| A．Thank you so much! | B．Let’s go and see. |
| A．What’s | B．Where | C．Where’s |
| A．Where | B．What | C．Really |
is on the wall. 
| A．Where’s | B．What’s | C．Who’s |
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