Try your best to help the people when they are in trouble, _______you will feel pleased and happy.
I had just finished all my homework and was about to go to bed the phone rang.
--- How is Dennis getting along with his work? --- Well, he could always _______ a new idea for increasing sales.
When he came to the door, my father ___ him at once although he was now a very old man.
–Do you mind my smoking here? --______.
This problem is not worth____ again.