---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
If you are an Englishman, you may say “________________”
The Art Festival _______ in our school next month.
—Why not watch the popular TV program “If You Are The One” (非诚勿扰)? —_________________.
If you work hard and never __________, you will learn Maths well.
—Mother’s birthday is coming, I’ll make a card for her. Please keep it secret. —_____________.I won’t tell anybody about this.