我下楼去接电话。

I went ___downstairs to answer the phone.

当我在你家时，你妈妈叫我帮她搬一些东西，所以我把钱包放在你的床上，然后下楼去帮她。

While I was in your house, your mom called me to help her carry some stuff, so I left my purse on your bed, and went ___downstairs to help her.

她跑下楼去迎接她的朋友。

She ran ___downstairs to greet her friends.