留着那些塑料袋；购物时可能会派上用场。

Save those plastic bags; they could ___come ___in ___handy for shopping.

一个备用手机充电器在电池电量低时会很有用。

A spare phone charger will ___come ___in ___handy when your battery runs low.

在家里备一个急救包在小事故发生时可能会派上用场。

Keeping a first aid kit at home might ___come ___in ___handy during minor accidents.