Remember to do this in time of H1N1 ---         constantly the windows to let fresh air enter and move around inside, and avoiding the access to the crowds, a necessity everyday. 
#91817
A
open
B
we open
C
opening;
D
to open
推荐题目
The expert offered us another piece of advice , ___ of great help to our program. 
#91750
A
I think it is
B
I think which is
C
which I think it is
D
which I think is
 Mother went shopping; __________, I cleaned the house.
#91773
A
while
B
when
C
however
D
meanwhile
Mike is excellent in math, _________, he didn’t pass the final exam this time.
#91784
A
for example
B
believe it or not
C
as usual
D
as a matter of fact
— ______ will get the first prize?— I'm sure, Li Hua. 
#91745
A
Who do you think
B
You think who
C
Do you think who
D
Whom do you think
—What do you think of this performance?—______,I don’t like it very much.
#91810
A
Honest    
B
Being honest
C
Be honest    
D
To be honest