There are ________ people in the supermarket. It’s so crowded.

They don’t think advertisements are useful for our daily life, .

Is the man standing outside the teacher’s office Mr. Zhou? –No, it ______ be him. He has gone to Hong Kong for an academic conference.

Why did you leave without a word of warning to John? ——But what_____________otherwise? He never listens to me.

You must remember _______ the window before you leave.