Riding a bike is good exercise and great f____ But what do you do with your old bikes? American girl Nicole Basil has a w____answer to this question. She set up Pedal Power – a charity (慈善团体) to collect (收集) old b____and give them to people who need them.

    Nicole started Pedal Power when she was o____ 8 years old. She collects more than 250 bikes each year. Every November, Pedal Power holds a bike race to ask for more donations (捐赠品).

    Nicole also gives bikes to students as p____ Top students and hardworking students both get t____ “Some kids aren't as lucky as others , b____ they still do well in school,” she says. “ And I think they should get a prize.”

    A bicycle shop helps Nicole check every bike for the races so that n____is wrong with those bikes in the race. The owner of the bicycle shop says he is happy to h____the charity." This is just wonderful," he says." We need to learn from Nicole to help o____. People all think it's a good idea to do so.

分子非常小，如果把分子看成小球，那么一般分子的直径大约只有____ m．

照样子，用带横线的词造句。

他常常紧盯空中飞翔的鸽子。