The students ____their classroom every afternoon.A. are cleaning B. clean C. cleans
— Jim, what did I say just now?— Sorry, I ______ of something else.
The boy looked __________ because he didn’t pass his maths test.
I think there will be _____ people and ______pollution.
-- Must I do my homework right away?-- No, you _____. You_____ do it later.
They arrived early at the airport, __________they had time to go shopping.