上个月零售额意外下降。

Retail sales ___unexpectedly fell last month.

他上周意外地打电话来了。

He called in quite ___unexpectedly last week.

他在工作时意外地打电话给我，并让我立刻去他的办公室。

He called me really ___unexpectedly at work, and told me to go to his office at once.