有人看见他在商店里偷糖果。

Someone saw him ___stealing candy from the store.

他趁没人注意时偷偷拿了一块饼干。

He ___stole a cookie when no one was looking.

小偷悄悄溜进房间，以免惊醒熟睡的人。

The thief was ___stealing into the room to avoid waking the sleeping people.