i don't know how to do?the questions about science~help~

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i don't know how to do?the questions about science~help~
State the field of science for each of the following:
1.the making of artificial rain.
2.sources of petroleum.
3.the production of plastic from crude oil
4.the ability of penguins to live in very cold places.
5.the use of solar energy to generate electrical energy.

1、meteorology气象学
2、geognosy地质学
3、chemistry化学
4、biology生物学
5、chemistry化学

i don't know how to do?the questions about science~help~ please,help me.I don't know how to do it . I don't know how to _____my sad feeling.Can you help me?A.do I don't know how to help him同义句 1,I don’t know how to use the telephone.2,How do you use the I don't know how to tell you about the point. sometime I thi I can't help ___ the job.because Idon't know how to do it. HELP!I don't know how i can get to the cinema.(保持原句意思)I don' I don't know how can I ask questions? i don't know how to do it句型转换 i don't know ()to do.填what还是how I really don't konw how to do about it