—Excuse me,is this the right way to the bookstore?—Sorry,I’m not sure.But it________be.
---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 _______________ .
—How often do you clean the fish tank? — .