He did all he could to try to get the car to start ,but it ______ work .
He turned down the request of his friend because it was the limit of his power.
After driving for five hours, they arrived at they thought was the place they had been dreaming of.
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.