Birds head south to warmer climates when ________.

If one of the participants in a conversation wonders ________, no real communication has taken place.

He________looked forward to the new venture.

The juice contained in the brittles of the nettle causes an intense itch when ________ a persons skin.

Everyone ________ albinos has a certain amount of pigment in the skin to add color.

In the Morrill Act, Congress granted federal lands to the states ________ agricultural and mechanical arts colleges.

Ancient people believed that ________ with a sun and a moon rotating around it.

Technically, glass is a mineral and ________.

Unlike the earth, which rotates once every twenty-four hours, ________ once every ten hours.

They were happy the train arrived on time and ________.