Edison never gave up, ________ he failed many times.

[　　]

A．and　　B．though　　C．or

－Bill, is this your book?

－Yes, it's ________.

[　　]

A．yours　　B．his　　C．mine

My father will be back from Beijing ________ a week.

[　　]

A．for　　B．in　　C．after

－Do you have ________ bike?

－Sorry, I don't have one.

[　　]

A．a　　B．the　　C．不填

Which of the following signs has nothing to do with traffic?

[　　]

A．

B．

C．

D．

Among the four words “already, beach, break, idea”, the underlined parts(划线部分) have ________ kinds of pronunciation(发音).

[　　]

－Did you pass the physics test?

－No. Many of the problems were so difficult ________ few of us could do them.

[　　]

－What do you think we should do with the bag?

－Stop the traffic, move the bag away, and then let the traffic ________ again.

[　　]

－I think both pairs seem all right to you.

－But I really don't know ________ to buy.

[　　]

－How about your parents?

－So far there ________ no word from them.

[　　]