小福利导航

1.   ?    a dinner.
2.   ?    a movie.
3.   ?    a dance.
4.   ?    a concert.

1.   ?    the woman has invited him to a dinner before.
2.   ?    the woman has invited him to a concert before.
3.   ?    tomorrow is his birthday.
4.   ?    tomorrow is her birthday.

1.   ?    The woman doesn't accept the invitation although she will not be busy tomorrow.
2.   ?    The woman doesn't accept the invitation because she'll be busy tomorrow.
3.   ?    The woman accepts the invitation although she'll be busy tomorrow.
4.   ?    The woman accepts the invitation because she will not be busy tomorrow.

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