.Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.

Not until his father died _______ what his father really meant.

下列句子中加横线的词语与现代汉语意义最接近的一项是（ ）

Jane requested that Mr. Smith _________ her another chance.

He reads newspapers every day _____ fall behind time. [ ]