Not until the mother shouted at the top of her voice _____ his head.
A. that the boy turned
B. did the boy turn
C. the boy didn't turn
D. the boy had turned
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Although he had not been in the field long, he had succeeded_____other researchers who had worked for years had failed.
A. which
B. that
C. what
D. where
The dietitian told the mother to prepare a meat-and-vegetable meal for the baby,____the baby is overweight.
A. on the condition of
B. because
C. for
D. when
_____ the weather was fine, I opened all the windows.
As
Because of
C. For
D. With
The fuel must have been finished, _____ the engine stopped.
A. since
B. as
C. because
D. for