There is ______ “u” and _____ “l” in the word “ruler”．
| A．a：a | B．an；an |
| C．a；an | D．an；a |
—__________ people are there in the meeting room?
—About 200.
| A．How many | B．How long |
| C．How much | D．How often |
It’s quite late now, __________ Xiao Ming is still busy with his lessons.
| A．or | B．so | C．and | D．but |
I visit my grandparents __________ Saturday afternoon.
| A．on | B．in | C．at | D．of |
The students are from England and __________ maths teacher is from China.
| A．they | B．them |
| C．their | D．theirs |
There are so many foggy days these days. We all wonder .
A. how is the air polluted
B. why the air is polluted seriously
C. what are the real reasons