用方框中所给单词的适当形式填空，每词限用一次。
worry, they, shark, sleepy, towards
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(1) Take some rest after lunch and you won't feel ____ in the afternoon. .
(2)When the child saw her parents waiting at the school gate, she ran ____ them.
(3)Don't ____ about your exams, everything will be fine.
(4)To protect____ , scientists suggest the people stop fishing in some parts of the ocean.
(5)My host family is really nice .They try____ best to make me feel at home .
