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根据短文内容完成句子（所填内容可能是单词、短语或句子）。

Brush your teeth every day, dentists say. In the south of Africa, some people brush their teeth with sticks first.

They keep a small stick in their mouth to chew(咀嚼) or scrub(洗刷) their teeth all day. People cut the sticks from trees. They are the African toothbrushes. People there are used to brushing their teeth with sticks.

Africans think the sticks work better than toothbrushes. The sticks come from nature, and it is said that there is something special about them. The special thing may stop many kinds of tooth problems. “If you have a bad tooth, it is a medicine,” said Diop, a seller in Africa.

The sticks also cost less than toothbrushes.

In Senegal(塞内加尔), the chewing stick is called “sothio”. It means “to clean” in their language. In east Africa, the stick is called “mswaki”. It’s their word for “toothbrush”.

Nowadays, some nice health stores in the United States start to sell chewing sticks. They think that the stick is natural kind of tooth care.

1．Some people ____________ brush their teeth with sticks first according to the passage.
2．Africans keep ____________ in their mouth to chew or scrub their teeth all day.
3．The sticks ____________ than toothbrushes.
4．“Sothio” means “____________” in Senegal’s language.
5．The special thing in the sticks may help ____________.