— Look! There is a horse racing program on TV now.— Hmm .... It __exciting.
They waited and waited, and_____ he came back.
---It was ___________ who helped us out of danger.---What brave and helpful children! We should learn from them.
My mother was doing the cleaning in the sitting room ________ the telephone rang.
Every day, too much water _______ in our school. We should save it.
— Must we go to see a doctor at once when we have the flu?—No,_____.A. we mustn’tB. we shouldn’tC. we don’t have to