To live a low﹣carbon life， we must remember ____ the lights when we leave the room．（ ）
| A． |
to turn off |
| B． |
turning off |
| C． |
not to turn off |
Mr．Brown is a teacher is strict with all is students．（ ）
| A． |
which |
B． |
who |
C． |
where |
do you eat out， Molly？
Once a month．（ ）
| A． |
How often |
B． |
How far |
C． |
How long |
It's 9：00 in the morning now． The students from Grade Nine an important exam．（ ）
| A． |
have |
B． |
had |
C． |
are having |
Michael visits many websites about Chinese culture．（ ）
| A． |
learn |
B． |
learned |
C． |
to learn |
Foreigners often use body language to show feelings．（ ）
| A． |
they |
B． |
their |
C． |
theirs |