—How amazing it is that astronauts are exploring outer space!—It's a challenge, I guess, ______ man against nature.
.During the test we were supposed to stay in our seats , keep our eyes on our work , ___________to anyone .
The moon is___________the earth .
—Have a good rest ; you need to___________your energy for the football match this afternoon . —Thanks a lot .
This is the book I bought yesterday , ___________I spent 8 yuan .
Jack had traveled six miles across the Channel___________his engine failed and was forced to land on the sea .