阀导通的条件是什么？

请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

three    safe    health     they      educate

小题1:In the modern world, we should pay more attention to food. We should eat very       .
小题2:Today is Children’s Day. The children are enjoying        festival now.
小题3:To support a big family, his father has to look for a        job besides delivering newspapers and milk.
小题4:For your       , you mustn’t stand under the tree when it’s raining in summer.
小题5:Last month, Mrs Obama, U.S. First Lady, paid a week-long visit to China focusing on      . She visited some schools and universities.