“Don’t ________to strangers.”Father often________to me.
Wood catches fire easily, so we must remember _________ fire.
---Why does the boy have few friends?---Because he is_______.
The little boy wasn't listening _______ in class, so he often missed some important parts.
It is said that we will have _____ one-day holiday tomorrow, it’s ______ good news for most of the students.
They had a wonderful time _______________ .