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Choose whether the following clauses in bold are main or subordinate. pls answer all of them if you can! thank you

1. Christa likes bicycling, while her sister Bridget prefers swimming.

2. Although geometry is difficult for Mark, he studies very diligently.

3. You will do well on the test only if you spend enough time studying.

4. The girls on the soccer team stretched before they started running.

5. Andrew would not tell me whether or not he was coming to the party.