1. 根据汉语提示完成英语句子。
(1) Be quiet ________(当我正在做作业时)。
(2) She’ll return the books to you _________(她一看完)。
(3) ________(当我七岁时), I could ride a bike.
(4) I didn’t go to bed _________(直到我父亲回来) last night.
(5) Kate went to bed _________(在她完成作业后)。
(6) I went to say goodbye to my friends ________ (在我去美国之前)。