While         the book on the top shelf , you need to be very careful .
#85820
A
to reach
B
reaching
C
reach
D
are reaching
推荐题目
There ______a basketball match this afternoon.
#44146
A
will be
B
will have
C
is going to be
D
is going to have
 Between two rows of trees _____ the teaching building. 
#86196
A
stand  
B
stands  
C
standing   
D
are
–Have you heard the latest news?-No, what ____?
#86340
A
is it
B
is there
C
are they
D
are those
One and ___ hours ____ all I can spare for you tomorrow . 
#86057
A
half ; are
B
a half ; are
C
half ; is
D
a half ; is