---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.
Zhang Guorong’s singing career _________ about over 20 years. It was his _______appearance at singing in public.
They thought __________ important to look right and left when ________ the road.
________ our teacher is ill, ________ he still come to our class to teach us.
She was very happy because she ________ play the lead role of a young princess in the Hollywood film.
I haven’t had enough _______recently, so I’m always _______all day.