----Could I call you by your first name?

----Yes, you ________.

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----Susan, go and join your sister cleaning the yard.

----Why ________? John is sitting there doing nothing.

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Though ________ money, his parents managed to send him to university.

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The research is so designed that once ________ nothing can be done to change it.

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The boy wanted to ride his bicycle in the street, but his' mother told him ________.

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Equipped with modern facilities, today's libraries differ greatly from ________.

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----Why don't you take a break?

----Didn't we just have ________ ?

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Please give me the reason ________ you were late this time.

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The water in the river flew at top speed, ________ difficult for the PLA men to save the drowning girl.

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Hangzhou is the place ________ I visited last summer.

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