1¡¢------ How was your weekend, Rose?

  ------ Awful! This was the first time I ______ alone at home, bored to death.

A. had left      B. had been left        C. have been left         D. have been leaving

2¡¢The thief is caught stealing and is now _________ in the police station.

A. watching over          B. watching out for  C. being watched over    D. to be watched out

3¡¢----What do you think of the restaurant?

---- Great. The customers here ______ good service.

A.are given     B.give       C.have given     D.were given

4¡¢Many precious animals            by this project so far.

A.have saved          B.have been saved
C.had saved          D.had been