The medicine has a strong side ________ on our health though it works well.
#5751
A
influence
B
effect
C
affect
D
impact
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It will take a lot of time and_____ to finish the task on time. 
#5504
A
power
B
pressure
C
struggle
D
energy
 We paid ________ cash in the hope that we can get a 15% _________.
#5169
A
by , count
B
with , account
C
in , discount
D
in , charge
Chest pains can be a  warning ____of heart problems.
#5747
A
signal
B
sign
C
mark
D
symbol