根据句意，在相应的横线上，写出括号内所给单词的适当形式。
【小题1】An advantage of using the solar energy is that it won’t create anypollution (pollute).
【小题2】Our headmaster is thestrictest (strict) with us among the teachers who teach us.
【小题3】What an enjoyable (enjoy) journey they had the day before yesterday!
【小题4】Those volunteers always think more of others than of themselves (they).
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解析：根据句意，在相应的横线上，注意括号内所给单词的适当形式