B .
C .
A.
B.
C.
D.
E.
—_____

B .
B .
—________
⑴
A.
⑵
B.
⑶
C.
⑷
D.
⑸
E.
⑴Let me clean the teacher's desk. A. 
⑵Let's clean the classroom. B. 
⑶Turn on the light. C. 
⑷Please open the window. D. 
⑸The picture is on the wall. E. 