Sarahknewnothingaboutithersist

Sarah knew nothing about it ____________ her sister told her.
A. if B. until C. since

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I don’t doubt _________.

A．that the music is worth listening to

B．if the music is worth listening to

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— Yes. His _________ birthday is coming next month.

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A．how; take	B．what; taking
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—How much difficulty did you have this problem?
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A．to solve; No	B．solving; None
C．solving; Nothing	D．to solve; Neither

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—It’s dangerous to walk across the street carelessly.
—You’re right. We can’t be _________ careful while crossing the street.

A．so

B．very

C．too

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