用所给单词的适当形式填空

① The doctor has saved three (life) today.

② Mike's(foot) are big , but his (tooth) are small. 

③(thousand)of visitors visit Mount Huang every day. 

④The Greens(have) been to Hong Kong twice.

⑤(orange) is my favourite fruit.

⑥The(leaf) turn yellow in the autumn.

⑦There're two(Japanese) and three (German) on the bus.

⑧The guide has collected all the (visit) ID cards.

⑨There're aboutnine (hundred) students in the school.

⑩(million) of people has no houses to live in after the earthquake.