New Words：

so far 到目前为止；迄今为止；至今
invitation [.invi'teiʃən] n. 邀请；邀请函

Sample Sentences：

I appreciate your invitation.
Thank you for your kind invitation.
We printed two hundred and fifty invitations.

I have had no reply from her so far.
How many driving lessons have you had so far?

appreciate [ə'pri:ʃieit] v. 欣赏；感谢；感激

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