------ He should have been warned of the danger.------_________, but he wouldn’t listen to me.
The idea for the new plan came to his mind,________ to his experiment in the lab.
Your understanding on the theory is________satisfactory. You must read more after class.
Not until they left school________ how much their teachers loved them and helped them.
I thought Peter would have helped you.________is a great pity that he should be so selfish.
We have to________new customers to our restaurant by providing the best service at the lowest price.