Match the new words with their corresponding explanations.
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Choose the best answer to complete each sentence.(选择最佳答案完成句子。)The children ran away from the orchard(果园) ______ they saw the guard.
A. the moment
B. for
C. before
D. as
It seemed only seconds ________ the boy finished washing his face.
A. when
B. before
C. after
D. even if
Speak to him slowly _____ he may understand you better.
A. since
B. so that
C. for
D. because
He can’t have gone out, ______ the light is still on.
A. because
B. since
C. as
D. for