.Having checked the doors were closed, and _____all the lights were off, the boy opened the door to his bedroom.
| A．why | B．that | C．when | D．where |
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What are you doing out of bed, Tom? You're to be asleep. ,
| A．supposed | B．known | C．thought | D．considered |
With new technology, pictures of underwater valleys can be taken color.
| A．by | B．for | C．with | D．in |
The employment rate has continued to rise in big cities thanks to the efforts of the local govenments to increase.
| A．then | B．those | C．it | D．that |
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