--I’m worried about my English. -- ______ harder ________ you will catch up with your classmates.
#70935
A
Working; and
B
To work; or
C
Work; and
D
Worked; or
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—Will you please _______ the flowers?  —Sorry. I won’t. 
#71089
A
pick
B
don’t pick
C
not to pick
D
not pick
John had a short walk after lunch, ______?
#71103
A
did he
B
didn’t he
C
had he
D
hadn’t he
─             did they go to work last week ?     ─Once .
#70504
A
How many times
B
How often
C
How soon
D
How long