_________ his telephone number, we didn't connect him.

[　　]

A. Having not known

B. Not knowing

C. Not to know

D. Not know

Is this shop ________ you told us of last month?

[　　]

She works in the factory _________ her father once worked.

[　　]

I have done the work in the way ________ you showed me.

[　　]

The old couple _________ for fifty years.

[　　]

A. married

B. have married

C. are marrying

D. have been married

It's not good to interrupt people __________.

[　　]

A. while talking

B. when talking

C. while they were talking

D. while they are talking

_________, I would like to introduce to you our honored guest today, Mr. Washington.

[　　]

The workers ________ the project of repairing the old building.

[　　]

A. are working on

B. are working at

C. are working over

D. are working out

John said he'd been working in the office for an hour,________ was true.

[　　]

Recently I bought an ancient Chinese vase,________ was very reasonable.

[　　]

A. which price

B. the price of which

C. its price

D. the price of whose