Answer:
1. The Democrats [need] to regain California, so they launched a series of aggressive TV ads.
2. Before he [begins] his expeditions, Amundsen always made meticulous preparations.
3. Hans Blix and his team were [denied] access to the nuclear facility, so they had to return to their hotel.
4. Because Professor Ancram had [labored] through the night, she was able to announce her results before the middav deadline.
5. After they had [exposed] known reserves around the world, oil companies began to look for the Arctic for new sources of petroleum.
6. The bridge rises automatically on the approach of tall ships, and therefore [grants] them(the ability)to pass.
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