Is oxygen the only gas ______ helps fire burn? [ ]A. it B. which C. / D. tha

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Is oxygen the only gas ______ helps fire burn? [ ]
A. it
B. which
C. /
D. that

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举一反三

Winter is the time of year ______ the days are short and nights are long.
A. on which
B. that
C. when
D. where

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Do you know the reason ______ she got so angry yesterday ? [ ]
A. why
B. which
C. for that
D. for why

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Is ______ some German friends visited last week?
A. this school where
B. this school one
C. this the school
D. this school

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Can you lend me the book ______ the other day ?[ ]
A. which you talked
B. that you talked
C. about that you talked
D. you talked about

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This is one of the best films ______ this year.
A. which has been shown
B. that have been shown
C. that have shown
D. have been shown

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