If we         now to protect the environment, we’ll live to regret it.
#53390
A
hadn't acted
B
haven't acted
C
don't act
D
won't act
推荐题目
 —What       did they        yesterday?        —The plan for the National Holidays.
#57606
A
other, argue
B
else, argue
C
other , argue with
D
else, argue about
 Did you _____ much money on the car?
#59061
A
cost
B
pay
C
spend
D
take
We didn’t plan our art exhibition like that but it _______ very well.
#55895
A
worked out
B
tried out
C
went on  
D
carried out
Rather than _________ on a crowded bus, he always prefers __________ a bicycle.
#62070
A
ride; ride
B
riding; ride
C
ride; to ride
D
to ride; riding