垂直上升的火箭开始拐弯，宛如一条白龙在长空飞行。宛如这个词是什么意思，它能换成什么词？

foot的复数形式是____。

— Does Bob ______ a tennis ball?

— Yes, he ______.

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.