descend|descended|descends

许多美国人祖先是在19世纪抵达的移民。

Many Americans ___descend ___from immigrants who arrived in the 19th century.

他小心翼翼地爬下梯子。

He ___descended the ladder carefully.

这条小径缓缓地向湖边延伸。

The trail ___descends gently towards the lake.