1.  What's up?

2.  "What's up" said the boy amazed.

3.  The answer is up to you.

4.  Under the pressure of the economic globalization , cultural diversity protection shall be up on the agenda.

5.  We might stay up to give a party and enjoy ourselves to the full.

6.  It's just up to you, my freshman.

7.  The choice is up to you.

8.  As far as I am concerned, whether we should date during the college is up to ourselves.

9.  And up till the recent years, the students going overseas have become younger and younger.

10.  He was described as an exacting and sometimes fearsome leader, ordering up and rejecting multiple versions of new products until the final version was just right.