It was such a serious mistake, ________ caused by carelessness.

A．which I think was

B．which I think it was

C．I think which was

D．I think which it was

In competitions, only women perform on the high-and-low bars, ________ is higher than the other.

A．one of them

B．one of which

C．the one

D．one of the two

The general at last got a chance to visit the vil1age ________ he used to fight， ________ he had been dreaming of for years．

A．that；which

B．where；that

C．in which；what

D．where；which

He often helps the students ________ he thinks are not quick at their studies．

A．whom

B．who

C．when

D．because

Chaplin had developed his own manner of acting，________ was to become world-famous．

A．the one

B．the one that

C．that

D．it

Dorothy was always speaking highly of her role in the play， ________，of course，made the others unhappy．

A．who

B．which

C．this

D．what

Professor White has written some short stories, but he is____ known for his plays.

A．the best

B．more

C．better

D．the most

If you are ________ about Australian cities, just read the book written by Dr．Johnson.

A．interested

B．anxious

C．upset

D．curious

My elder brother ________ knowledge of radio just by staying around the radio station.

A．accepted

B．took up

C．picked up

D．learnt

Now the house ________ he once lived in has only its walls ________.

A．where; are left standing

B．in which; left standing

C．which; to leave standing

D．which; left standing