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--- Is your mother the same age ________ your father?

--- No, my mother is ________ younger than my father.

[　　]

The boy ________ back until his father called him.

[　　]

They said goodbye ________ me ________ the airport. They said, “Good luck ________ your trip!”

[　　]

People find ________ very important to develop the students' abilities.

[　　]

It's not easy ________ sorry to your best friends.

[　　]

My sister is ________ to go to school this year.

[　　]

My best friend is very worried because he has ________ money to ________ the summer camp.

[　　]

When you are ________ trouble. You should ask the policeman ________ help.

[　　]

You can't borrow colour pencils ________ Li Lei, because he doesn't have colour pencils, ________.

[　　]

--- Why is your sister upset?

--- Because she ________ the final exam.

[　　]