you turn off all the lights when you leave the classroom.  
#96287
A
Making sure
B
To make sure
C
Being sure
D
Make sure
推荐题目
To keep the town clean, the truck ____ garbage is prevented ____ entering the town.
#97468
A
loaded with; /
B
loading with; from
C
loaded of; from
D
loading of; /
The house is not large enough ____ .
#97513
A
to live in
B
to be lived in
C
to live
D
for living
 I’m calling to enquire about the position_______ in yesterday’s China Daily.
#89917
A
advertised
B
to be advertised
C
being advertising
D
having advertised