1. Language is proper to mankind.

2. The nesting instinct is proper to birds.

3. It is proper to end this presentation by returning to the equation we began with.

4. It just wouldn't have been proper to not invite Jeff.

5. He wondered whether it would be proper to visit him at this hour.

6. He wondered whether it would be proper to wait at her door.

7. He wondered whether it would be proper to at her door.

8. It would be proper to say that economic development determines the developing direction and tendency of audit However,(Sentence dictionary) audit is not alway...

9. I also agree with Scott L.J.'s observations about the form of order that would be proper to be made.

10. By quite a number of positive and negative experiences in the past, it might be proper to have some overall survey on the future prospects for the coming Century.

11. And I don't think we should do either one. I think it would be proper to even talk about trading with North Korea.