1 . They didn't discover until they happened to enter the back room _________ someone had stolen the priceless painting.

A．that

B．what

C．which

D．when

2 . You are saying that he is dishonest, and this is       I disagree.

A．why

B．where

C．what

D．which

3 . The greatest discovery of our generation is _____ a human being can change his life by changing his attitudes.

A．that

B．which

C．what

D．how

4 . Robots can be reprogrammed by a computer to do another one after completing one specific task, and this is ______ automatic machines differ.

A．because	B．what
C．where	D．how

5 . —What a mess! You are always so lazy!
—I’m not to blame, mum. I am ________ you have made me.

A．how

B．what

C．that

D．who

6 . It came as a great ___________ to the parents that their son finally came back safe and sound.

A．favor	B．sense
C．relief	D．relaxation

7 . Some hotel porters ___________ anybody who wasn’t wearing a collar and tie.

A．turned against	B．turned off
C．turned up	D．turned away

8 . Sometimes smiles around the world ___________ be false, hiding other feelings like anger, fear or worry.

A．can	B．would
C．should	D．must

9 . We ________ the bridge for over two years and it will be half a year before it’s completed.

A．are building	B．have built
C．have been built	D．have been building

10 . ---- Did you know any German before you got to Berlin?
---- Not a single word _________.

A．have I learned	B．had I learned
C．I’ve learned	D．I had learned