erect|erected|erecting

旗杆在风中依然笔直地竖立着。

The flagpole remained ___erect in the strong wind.

他们在公园里竖起了一座新的纪念碑。

They ___erected a new monument in the park.

工人们正在竖立新的广告牌。

The workers are ___erecting a new billboard.