Go on ________ the other exercise after you have finished this one.
Although there is no life on Mars now , some scientists think that there some form of life a long time ago .
They were playing in the garden they heard a scream .
Many people in this country eat as they actually need every day.
He must have had an accident , or he here for class then .
All flightsbecause of the snowstorm, many passengers could do nothing but take the train .