With ____ leaves ____ in the earth every year, the soil becomes richer and richer.
| A．falling; burying | B．fallen; buried |
| C．fallen; burying | D．falling; buried |
—Liu Xuan, did you see the Denmark’s famed “Little Mermaid” sculpture in Shanghai Expo?
—No, I didn’t. I _______ it twice in Denmark.
| A．have seen | B．were seeing | C．had seen | D．saw |
My cousins _______ me and ask me what I was doing when I was studying in Canada.
| A．used to ringing | B．were used to ring |
| C．were used to ringing | D．used to ring |
Larry and his wife were killed in the volcanic eruption, _______ their 5-year-old son alone in this world.
| A．leaving | B．and left | C．to leave | D．left |
Make ______ a habit to put whole-grain biscuits, nuts or raisins in your backpack.
| A．/ | B．this | C．that | D．it |
Pompeii _______ by so many tourists that some of the relics are not well protected.
| A．has been visited | B．is visited | C．is visiting | D．was visited |