—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
Before our study we did not have data that could tell us __ those changes were small or large .
Generally speaking , almost all the kids are ______about how everything around them works.
Our government’s plan to fight against air pollution will focus on _____ information and handling PM2.5.
Each time I ________ a good essay when reading newspaper , I cut it out and keep it.
A harmonious society is very important , so all the laws must be strictly _________.