---Sorry, Professor Smith. I didn't finish the assignment yesterday.---Oh, you have done it as yesterday was the deadline.
We can’t continue to pretend that the problem of pollution doesn’t___________in this city.
We must do whatever we can to ______the river from being polluted any more.
We should try our best to___________ those people after the disaster.
— I’d like to take a week holiday. — ________, we are too busy.
---Are you going to attend the meeting _____ next Saturday? ---I won’t unless invited.