Tigers _______ meet-eating animals ________ meats.

________ from space, the earth is blue.

-- What’s the matter with you? ---____ the window, my finger was cut unexpectedly.

Though ________ to see us,  the professor gave us a warm welcome.

Millions of people watched that first moon landing on television, their hearts in their mouths, aware of how difficult and dangerous an adventure it was, and what risks had to be ____.