Christina wasn’t saying anything, but the professor smiled at her ______

Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever.

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as if

now that

while

though

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Use your head, _______ you’ll work out the problem.

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for

and

---__________in New York does he live?         --- Maybe the west.

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How

Whereabouts

When

Why

Schools in the south tend to be better equipped，_______those in the north are relatively poor.

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while

since

when

We must live up to _____ have been expected of ourselves.

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what

which

that

all what

Tom eagerly findished up ________ was left of the chicken pie.

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what

that

which

where

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