—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
The more one is_______ the English-speaking environment, the better he or she will learn the language.
It’s time that you_____with the relief work in the flood-stricken area after the awful typhoon.
Drunk driving, which was once a frequent occurrence, is now______.
_____snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest.
When they had finished playing, the children were made to _______ all the toys they had taken out.