The students can’t go home________they finish cleaning the classroom,for it’s their duty.
I ________ let him know it as soon as he ________ back.
He used to _____ with her parents, but now she is used to ____ with her classmates at school.
--- ____ you _____ of the pop singer called Justin Bieber?--- Yes, I have. His voice sounds_____.
I always tell my students _______ on the road because it’s really dangerous.
—Mum, must I stay there the whole day? —No, you .You come back after lunch, if you like.