—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
----Are my clothes too casual?----No. You can go ____you are.
How ___ I help them to understand when they won’t listen to me?
In summer, food will go bad if________in room temperature.
QQ,________you can chat with your friends, makes communication easy.
_____ you don’t lose heart, I’m sure you can pass the coming examination.