I didn’t know when he     back. He said he would call me when he     home.

When we start gazing into the night sky with a telescope, soon we’ll be astonished by the realization _______ we and our world are part of this giant system.

It was clear that the speaker now trusted Dantes from the way _____ these words were said.

We felt amazed at the use　　the waste bottles.

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