Though he failed in the experiment again and again, he didn’t______, and at last, he made it.
This soldier __ jump into the water and saved the boy.
I want to buy a pair of new trousers to ___ my sweater.
There goes the bell for the class.Let’s stop___.
--Must we hand in our homework now?---No, you ___. You ___ hand them in before Friday.
When I was walking in the street, I heard my name ___.