___ from space, the earth with water ___70% of its surface looks like a "blue blanket".
It was ________I went there ________I began to know something about the matter.
________ got on the train when it began to move.
Looking at her _______ looks,we were _______.
She ________ to catch the early train,but she didn’t get up in time.
Fortunately,he escaped ________in the accident.