25. He decided to___________his career as a financial planner and to start his own project.
A) cut down
B) fill out
C)turn off
D) give up
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26. Not until we had reached the mountain top___________how high we had climbed.
A)did we realize
B) we did realize
C) do we realize
D)we realize
27. The doctor told us it was a robot___________performed the surgery.
A)whom
B) that
C)which
D)what
28.If I_______________the manual earlier,I would have been able to fix the machine.
A)got
B)get
C)have got
D)had got
29.____________self-driving cars are coming, the concept of driving will change dramatically.
A)Now that
B)Even though
C)In case
D)As if