【2015·天津】We need to get to the root of the problem______ we can solve it.
---Which one of these do you want? --- . Either will do .
After completing and signing it, please return the form to us in the envelope ________.
The manager was concerned to hear that two of his trusted workers ______.
Be- you can't expect me to finish all this work in so little time.
A number of high buildings have arisen _______ there was nothing a year ago but ruins.