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

小题1:Take some rest after lunch and you won’t feel ________in the afternoon. .
小题2:When the child saw her parents waiting at the school gate, she ran ________ them.
小题3:Don’t _______ about your exams, everything will be fine.
小题4:To protect________, scientists suggest the people stop fishing in some parts of the ocean.
小题5:My host family is really nice .They try _____ best to make me feel at home .