—Why did you leave the water running in the sink? —My goodness! I guess I ____ to turn off the tap.
They are teachers and don’t realize ________ to start and run a company.
I ____ him by surprise and he had no time to think of an excuse.
I’m sorry to ______ you, but can you tell me how to get to the library?
Remember that there is still one point ______we must make clear at the conference tomorrow.
The number of children who have lost parents due to AIDS ______to rise to over 26 million in 2011.