______ the help of the teacher, the student who wasn’t good at math ______ the difficult problem quickly.
#105063
A
Under; worked out
B
With; worked on
C
Under; solved
D
With; solved
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4.It is said that the early European playing-cards ____ for entertainment and education. 
#105262
A
were being designed
B
have designed
C
have been designed
D
were designed
The army officer _______ his men to fire as soon as the enemies came up.
#105157
A
requested
B
commanded
C
begged
D
suggested