Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.

The traffic on the main streets has a longer greensignal than______ on the small ones.

He took it for granted that these local laws ________ the new comers like himself. [ ]

Is that your best friend Kitty- No, it _________ be her. She flew to Singapore yesterday.

The window ____ by Tom yesterday. Mr. White is repairing it now.