It is high time that we started to consider what ________ we should take to reduce heavy smog caused by traffic fumes and other pollutions.
| A．affection | B．attention |
| C．measures | D．advantages |
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A brilliant idea____to me that I could make a Christmas present for my mother.
A,struck B, happened C, worked D，occurred
.A fire broke out in a neighbouring street yesterday,but it was soon_______by the firemen.
A,gone out B, put out C,given out D,made out
The house caught___fire last night but no one knows who set ___fire to it.
A. X；X B.X;a C, a; a D, a; X
The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
| A．who | B．when |
C．on which | D．Which |
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