They ________ to enter the building by the back door; however, the front door was locked.
One can always manage to do more things, no matter __________ full one's schedule is in life.
__________ I have to give a speech, I get extremely nervous before I start.
We are aware that,__________,the situation will get worse.
A man does not know the difficulty of anything __________ he does it personally.
You can borrow my car __________ you promise not to drive too fast.