The flowers his friend gave him will die unless________every day.
What shall we use for power when all the oil in the world has _________?
Your uncle seems to be a good driver: _______, I wouldn’t dare to travel in his car.
Seeing the car trapped in the snow drift, the driver didn’t know ______ it.
________ English will help to communicate _____ people from different countries in the world.
— I have just had my watch repaired.—How much did they ______ you?