The best way to prevent the air polluting _____ , but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
In my opinion, the most famous to tourists in the city is the wooden tower.
| A．attraction | B．impression | C．instruction | D．expression |
_ _ busy schoolwork, the children also have to take arts, music and sports classes in their free time.
| A．Rather than | B．Owing to | C．Except for | D．Apart from |
The United Kingdom of Great Britain ______ three main parts England, Scotland and Wales.
| A．is made of | B．makes up | C．is consisted of | D．consists of |
If you make most of every minute in class day after day, there will be switch in grades.
| A．/; / | B．the; a | C．/; a | D．the; / |
----Have you been to the Summer Palace?
----Perhaps not in my memory._______, it might have been during my early childhood
| A．If any | B．If ever | C．If only | D．If not |