When I put my ear on his chest, I could hear his heart still（）.

单项选择题Every possible means（）tried, but we can not open the door.

A．are
B．are being
C．were
D．has been

单项选择题You（）the dictionary to Tom yesterday, he needed them awfully.

A．must return
B．should have returned
C．ought to return
D．can have returned