—Excuse me, Madam.Taking photos is forbidden here out of security.
—I'm really sorry, I _______ of that.
A.am not informed B.hasn't been informed
C.hadn't been informed D.wasn't informed
The civil war broke out in Libya, ______ to the instability of the international oil price.
A.to contribute B.contributed
C.having contributed D.contributing
Recently a new social issue has been brought to everyone's attention ___ __food additives are abused.
A.when B.whether C.that D.which
While the police have already done a lot of investigation, much evidence ___ __.
A.is remaining to be confirmed B.remained to be confirmed
C.is remained to be confirmed D.remains to be confirmed
_____ on everyday practice, progress in English is a goal which can be achieved.
A.Based B.Basing C.Having based D.Being based
Look out! Keep away from the house, _____ the roof is under repair.
A.whose B.which C.of which D.where