We have breakfast at half  seven.  (   )

A．past

B．at

C．to

句子改错
1. I am on my way to home.
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2. Let’s meet in the library.
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3. This is Peter. Can I speak to Peter?
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4. Please call again on five o’clock.
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5. Please call him mobile phone.
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The baby is playing______ the yellow key.

A．with

B．to

C．at

Ms Smart is happy _____ your work. （ ）

A．for

B．with

C．to

My ruler is 15cm. Your ruler is 20cm. Your ruler is longer ________ mine. (    )

A．than

B．that

C．what