— Susan! Shall We go out for a picnic this weekend？                                
— Oh，with all this work ______, I don’t know if I’ll have time to go out.

Do you know the difficulty he has       what eco-travel means?

Our friendship        our childhood has lasted for years.

John rushed out in a hurry, ___________ the door ____________.

---What is our earth like ________from the moon?
---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".

The teacher couldn’t make himself       attention to because the students were so noisy.

_____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the world every day．

Mr Jackson was very angry to find the car he had had ______ yesterday broke down again.

The chairman asked many questions ________ the education of the homeless children in that area.

The boy ________ a strange disease is trying to live a normal life.