In our university there are several big parks ____we students can go to enjoy the beautiful scenery．
| A．to which | B．at which | C．from which | D．in which |
72. We couldn’t read the notice on the board because several people were standing _______ it.
| A．in front of | B．in the front of | C．at the back of | D．in back of |
71. People eat a lot of sugar __________ cakes, soft drinks, sweets and so on every day.
| A．in form of | B．in the shape of | C．shaped by | D．at form of |
70. I know it is difficult __________ him to talk like the lecturer, but I think he should grasp every chance .
| A．of | B．for | C．with | D．Over |
69. With the guide leading the way, the visitors were able to travel through the forest not by air but _____ foot.
| A．by | B．on | C．in | D．with |
68. When the boy playing by the river fell into the river, I was out of the room _______.
| A．in flash | B．in a flash | C．as a flash | D．for a flash |