根据要求改写下列句子，每空只填一词。

1. American athlete Bob Beamon won the gold medal in the long jump in 1968. (改为否定句)

    American athlete Bob Beamon _______ _______ the gold medal in the long jump in 1968.

2. We all think this is a very old clock. (改为同义句)

    We all think this is______ _______ clock.

3. Li Ming won the gold medal in the high jump at the school sports meeting last month. (改为同义句)

    Li Ming _______ _______ in the high jump at the school sports meeting last month.

4. Liu Xiang won a gold medal at the 28th Olympics. (就划线部分提问)

    _______ _______ did Liu Xiang win a gold medal at?

5. The athletes swam as fast as they could. (就划线部分提问)

    _______ _______ the athletes swim?