–Why didn’t you give a hand to the boy?-- I ______ , but he struggled to his feet before I tried to.
He turned down the request of his friend because it was________the limit of his power.
If you had worked hard, you ______ so anxious now.
______ I'm willing to help, I do not have much time available.
The rise of oil prices made scientists search for new energy resources ______ oil.
You didn't believe John won the first prize at the speech competition, ______?