Rewrite the sentences, using the present, past, or perfect participle of the [] indicated verb. 1. The Democrats [needed] to regain California, so they launched a series of aggressive TV ads.

2. Before he [began] his expeditions, Amundsen always made meticulous preparations

3. Hans Blix and his team were [refused] access to the nuclear facility, so they had to return to their hotel.

4. Because Professor Ancram had [worked] through the night, she was able to announce her results before the midday deadline.

5. After they had [exploited] known reserves around the world, oil companies began to look for the Arctic for new sources of patroleum.

6. The bridge rises automatically on the approach of tall ships, and therefore [allows] them to pass.