The boy found his bag _____(不見),so he began to cry.

題目：

The boy found his bag _____(不見),so he began to cry.

解答：

The boy found his bag missing/lost(不見),so he began to cry.
不見了有兩種說法
【miss】和【be lost】
這邊是非謂語
所以用【missing】和【lost】