On AIDS Day, the minister of Health Department demanded that the problems ______ paid special attention to.
A．referred to being B．referred to be
C．refer to being D．refer to be
Maria has written two novels, both of ___ have been made into television series.
A．them B．that C．which D．what
—I wonder if you could go with me to the supermarket.
—Sorry. I _______ my experiment report all the morning and haven’t finished yet.
A．write B．was writing
C．have written D．have been writing
_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
A．While B．Unless C．When D．Because
This morning I saw an old friend of mine in the street by ______.
A．event B．accident C．affair D．matter
Everyone should _______________ the environment.
A．make a contribution to protect B．make contribution to protecting
C．contribute in protecting D．make contributions to protecting
