--Who______ it be that is knocking at the door?--It ______ be Father, but I’m not sure.
As he reached ______ front door, Jack saw ______ strange sight.
—Excuse me, I wonder if you can help me? — Sure. ______ ?
---Please sit down and have a break. You have been working for three hours. ---No, thank you. _____.
The new comers found it impossible to _____themselves to the climate to make permanent homes in the new countries.
Reciting does much good in language learning and it _____helps to learn science subjects better.