choose的过去式和过去分式

例句：

We chose to do cross-country running.

我们选择进行越野赛跑。

She won the toss and chose to receive.

她猜中了掷币结果，选择接发球。

We chose Paul Stubbs to be chairperson.

我们选保罗斯塔布斯当主席。

A site has been chosen for the new school.

已为新学校选了校址。

It's hard luck on him that he wasn't chosen.

他未被选中真是不幸。

All of them are experts in their chosen field.

他们在各自选定的专业中都是专家。