Listen! Peter is singing in the classroom!—It _____ be him. He has gone back to his hometown.

______ the work is difficult, all the workers are keeping on working .

The picture ________ on the wall is painted by mynephew.

33．— Is it all right if I come at about 8.30 ? — No, I ________ the football match then

finally got up to leave,we both knew that a real friendship ________ between us.