Experiments of this kind ___in both the U．S and Europe well before the Second World War．
A.had conducted B.have conducted
C.have been conducted D.had been conducted
It is a truly delightful place, ________looks the same as it must have done 100 years ago with its winding streets and pretty cottages.
A.as B.where
C.that D.which
______ of danger on the road at night ,the girl had to go home with a friend _______ her.
A.Being warned; accompanied B.Having warned; accompanying
C.Warning; accompanying D.Having been warned; accompanying
The food ______ at the moment is for the dinner party.
A.cooked B.to be cooked
C.is being cooked D.being cooked
______several times, the young scientist still kept on making his experiments.
A.Having been failed B.Having failed
C.Though failed D.Because of failure
The reporters got to the airport, ______the pop star had gone.
A.only to tell B.only to be told
C.only to have been told D.only to have told
