Bears _____ fat stores throughout the summer and fallto have energy enough to last them through their winter sleep

He found _____ impossible to finish so much homework in an hour.

–I’ll be back at 4:30. Will you still behere– I’m afraid not. I’ll probably have goneout _______ then.

This morning traffic was ________ by an accident outside the town hall.[ ]

Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years ________ it has warmed in the 20,000 years since Ice Age.